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HARTL OPTICAL DISK with PROJECTOR

 

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 suitable for demonstration experiments and for group work  

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easy to use

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accessories fitted with magnetic mounts  

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compact size  

This version of the Harti disk is a modernization of well-known classic instrument, and facilitates many expeeriments in geometrical

 

Power requirements

The projector be may be run on either A.C. or D.C. current of  6 V 5 A, which is obtainable from almost all P.G.A. power supply units; we suggest the acquisitin of a trnsformer (cat. 2403.10) with 220 V primary, or a vesatile and economical power supply , or a vesatile and economical power supply unit such as our cat. 2403.35 which in addition to the 6 V 5 A output , also has outputs for 2, 4, 6,8,10 12 V 5A in both A.C. and D.C.

 

Dimension of the case: 470 x 300 x 80 mm.

Weight : 5.3 kg.

4401.50

HARTL OPTICAL DISK WITH PROJECTOR

Characteristics and description as above.

Accessories for the power supply requirements of 4401.50:

Trasformer , input 220 V output 6 V 5 A

 (cat. 2403.10), or

Low tension power supply unit

(cat. 2408.00 or 2403.35)

Spare parts for 4401.50:

 

4401.51

Set of optical elements

9 optical elements with magnetic attachment , in box.

4401.52

Light bulb, 6 V, with rectilinear filament.

4401.53

Single and triple-slit screen, with magnetic attachment

4401.54

Cylindrical lens, plani - convex..

 

 

4415.00

STUDENT OPTICAL BENCH

Made up of a section of U-shaped aluminum channel 1100 mm long, divided into two parts of lengths 700 mm and 400 mm, hinged together at one end.

The channel may hold a number of sliders on which the accessories are mounted. The graduated scale gives rapid and accurate readings of the slider positions.

The division of the channel into two sections hinged together makes the bench especially useful when the light beam is deviated prims or mirrors.

ACCESSORIES FOR 4415.00: 

4415.01

PLASTIC SLIDER

Section dimensions 50 x 50 mm, with 10 mm diameter hole for shaft-mounted accessories. The slider may be used on the optical bench, as well as directy on the work surface.

 

4415.03

LENS AND MIRROR HOLDER In black plastic. Accepts all circular lenses and mirrors of 50 mm diameter

 

4415.07

 

PLANE MIRROR, SCREEN AND SLIDE HOLDER

 

The black plastic holder is fitted with a spring clip and accepts accessories with a maximum thickness of 4 mm.

4415.09

PRISM TABLE

The plastic table is fitted with a clamp for the blocking of the prism.

 

4415.11

 

CANDLE HOLDER

 

In plastic, holds up to 4 candles with maximum diameter of 7 mm (cat.4415.12)

4415.12

CANDLES

Package of 10 candles for candle holder (cat.4415.11)

4415.13

 

JOLY PHOTOMER

 

Made up of two blocks of translucent material with dimensions 25 x 20 x 10 mm, separated by a sheet of opaque foil. If the two sides of the blocks are subject to uneven illumination, the blocks show a difference in colour.

Mounted on a plastic base, with window for observazion.

4415.15

 

LAMPHOUSE

 

Contains reduced-size filament lamp bulb of 6V5A; may be oriented in all directions within a 20 cone. The metal housing is painted black and is finned for better heat dissipation. Diaphragms may be directly attached to the lamphouse, with the special spring clip mount.

Complete with lamp soked, two-pole power cable with banana plugs, 6V 5A lamp bulb, base for raising the lamphouse to the height of the accessories, diaphragm with circular aperture, single-slit diaphragm.

Accessories and sare parts for 4415.15: 

4415.16 Lamp bulb, 6V 5A, spare

2403.10 transformer 6V 5A,  

 

4415.50

STUDENT OPTICAL BENCH WITH ACCESSORIES

Comprising:

1 optical bench, cat. 4415.00

6 slider, cat. 4415.01

4 hlders for flat mirrors, screens, slides cat. 4415.07

1 prism table, cat. 4415.09

2 candie holder , cat 4414.11

1 package of 10 candies, cat. 4415.12

1 jolly phometer , cat 4415.13

1 light source projector, cat 4415.15

1 light bulb, spare cat. 4415.16

1 transformer 6 V 5 A, cat. 2403.10

1 metal screen, cat. 4416.00

2 plane mirrors 50 x 50 mm, cat. 4430.02

1 concave mirror f = 100 mm, cat. 4431.02

1 concave mirror f = 200 mm. cat. 4431.04

1 convex mirror f = 100 mm , cat. 4435.02

1 convex mirror f = 200 mm, cat. 4435.04

1 biconcave lens f = - 100 mm, cat. 4441.02

1 biconcave lens f = - 200 mm, cat. 4441.04

1 biconcave lens f = - 300 mm, cat. 4441.06

1 biconvex lens f = + 100 mm , cat. 4445.02

1 biconvex lens f = + 200 mm, cat. 4445.04

1 biconvex lens f = + 300 mm, cat. 4445.06

1 biconvex lens f = + 500 mm, cat. 4445.07

1 equilateral prism , cat. 4450.14

1 right-angle prism, 90, 45, 45, cat. 4450.21.

 

 

4416.00

METAL SCEEN

Enamelled white one side, black the other. Dimensions 150 x 100 x 1 mm. Complete with plastic base, but is also compatible with screen holder 4415.07.

 

4416.10

METAL SCREEN WITH CROSS WIRES

Enamelled white one side, black the other.

Dimensions 150 x 100 x 1 mm

Central circular aperture E  7 mm, with fine crosswires. Complete with plastic base, but is compatible with screen holder 4415.07.

4418.00

UNIVERSAL OPTICAL BENCH

Triangular section aluminum tubular bed is supported on steel feet with levelling screws. A scale with millimeter divisions is silkscreened along one side of the bed which has a working length of 160 cm. The proposed accessories are mounted on the bench by means of the special saddies (cat. 4418.01). A minimum of five saddies is suggested.

 

 

4418.01

SLIDING SADDLE

Specially designed for the universal optical bench (cat.4418.00) , this saddle is locked on the bench by means of a unique spring clamp. The saddie is easily moved along the bench by turning a knob on the side, allowing for the exact alignment of the mounted accessory. The inner faces of the saddie which ride on the bench surface are covered with a thin layer of felt for smooth slinding. The position of the accessory mounted on the saddie may be read from the scale on the bench, through a circular plexiglas window engraved with a reference line. All types of elements may be mounted on the saddie, as long as these are fitted with a shaft of E 8-12 mm

 

 

4418.21

 

SLIDE AND SCREEN HOLDER

 

Black plastic circular baffle plate 130 mm diameter with 10 mm shaft. Suitable for slides of 5 x 5 cm.

4418.24

 

MULTIPLE CANDLE HOLDER

 

For four candles. Mounted on 10 mm shaft.

 

4418.26

CANDLES

Package of 10 candles for candle holder cat.4418.24

4418.28

 

SELF-CENTERING LENS AND MIRROR HOLDER

For unmounted circular lenses and mirror up to 100 mm diameter. The lens is held by 3 radial spring grips. Mounted on 10 mm shaft.

4418.29

 

PRISM TABLE

 

Circular platform 70 mm diameter, with a locking arm to hold prism.

Mounted on 10 mm shaft.

4418.31

 

TRANSLUCENT SCREEN

In plexiglas, frosted on one side. With 10 mm shaft.

Dimensions: 300 x 200 mm.

 

4418.33

TWO-COLOUR METAL SCREEN

White one face, matt black the other; oven bakeed enamel paint. Mounted on 10 mm shaft.

Dimensions: 300 x 200 mm

4418.60

 

ACCESSORIES RACK

In wood, with space for 8 items useful for the storage of accessories on 10 mm stems, used with the optical bench.

 

 

 

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4418.50 OPTICAL BENGH WITH ACCESSORIES

including:

1 optical bench, cat, 4418.00

6 sliding saddles, cat 4418.01

2 diaphragm older, 4418.03

1 set of diaphragms,  cat 4418.04 - 4418.11

1 iris diaphragm, cat 4418.13

1 adjustable slit diaphragm, cat. 4418.15

1 projection dioptric lamphouse, cat. 4418.18

1 spare lamp bulb, cat. 4415.16

1 trasformer 6V 5A, cat. 2403.10

1 lens and screen holder, cat. 4418.21

1 single candle holder, cat. 4418.23

1 multiple candle holder, cat. 4418.25

1 package of candles cat. 4418.26

1 prism table, cat. 4418.29

1 translucent screen, cat. 4418.31

3 accessories raks, cat. 4418.60

1 grease spot photometer, cat. 4423.00

1 set of mounted lenses:

1 biconvex lents f 50 mm, cat 4448.01

1 biconvex lents f 100 mm, cat 4448.02

1 biconvex lents f 150 mm, cat 4448.03

1 biconvex lents f 200 mm, cat 4448.04

1 biconvex lents f 300 mm, cat 4448.05

1 biconvex lents f 500 mm, cat 4448.06

1 biconcave lens f 50 mm, cat. 4449.01

1 biconcave lens f 100 mm, cat 4449.02

1 biconcave lens f 200 mm, cat 4449.03

1 biconcave lens f 500 mm, cat 4449.04

1 plane mirror on mount, cat. 4430.05

1 double-angle concave-convex mirror, cat. 4430.10

1 equilater prism, cat. 4450.14

1 right-angle prism (90, 45,45) cat. 4450.21

1 right angle prism ( 90,60,30) cat. 4450.32

1 pair of polaroid filters, mounted, cat. 4453.90

 

 

4419.00 OPTICAL DISK

for use with Optical Bench

The disk which is used for experiments in geometrical optics is made up of circular disk, matt white face, with a set of magnetically attached optical elements. One or more parallel light rays passing along the surface of the disk are used to study the behaviour of light rays passing through the optical elements. The four quadrant disk is gratuated in degrees, and mounted on a diameter 10 mm stem for application to sliding saddle 4418.01. The set of trasparent plexiglas optical elements, magnetically attached, includes: circular block, semicircular block, right-angle isosceles with different focal lengths, one divergent cylindrical lens, one trapezoidal prism, one plane mirror. A deformable mirror, magnetically attached, is also supplied.

Spare parts for 4419.00

Set of optical elements cat. 4401.51

4422.01 JOLY PHOTOMETER ON STEM

 

Same characteristics as 4422.00 but mounted on nickel-plated Brass stem for

use with Optical Bench 4418.00

4423.00

GREASE SPOT PHOTOMETER

A cardboard disk with a parafilm spot at its centre. Mounted in plastic screen diameter 130 mm, shaft diameter 10 mm.

4430.05 PLANE MIRROR

In glass, back surface silvered. Mounted in metal frame on 10 mm shaft.

Dimensions: 100x150 mm

4430.10 DOUBLE-FACE MIRROR

 

Comprised two mirrors, one concave and the other convex, mounted in the same circular frame on a diameter 10 m shaft.

Focal length; 100 mm

Diameter of the mirror: 42 mm

UNMOUNTED SPHERICAL MIRRORS

In optical glass with back surface silvered. Diameter 50 mm

 4431.02 Concave mirror f = 100 mm

4431.04 Concave mirror f = 200 mm

4431.06 Concave mirror f = 500 mm

4435.02 Convex mirror f = 100

4435.04 Convex mirror f = 200

4435.06 Convex mirror f = 500

SPHERICAL LENSES, UNMOUNTED

4441.01 Biconcave lens, f =50 mm 

4441.02 Lente biconcava f =100 mm 

4441.03 Biconcave lens, f = 150 mm 

4441.04 Biconcave lens, f = 200 mm

4441.05 Biconcave lens,f = 250 mm 

4441.06 Biconcave lens, f = 300 mm 

4441.07 Biconcave lens, f = 500 mm 

4441.08 Biconcave lens, f = 1000 mm 

4445.01 Biconvex lens, f = 50 mm 

4445.02 Biconvex lens, f = 100 mm 

4445.03 Biconvex lens, f = 150 mm

4445.04 Biconvex lens, f = 200 mm

4445.05 Biconvex lens, f = 250 mm

4445.06 Biconvex lens, f = 300 mm

4445.07 Biconvex lens, f = 500 mm

4445.08 Biconvex lens, f = 1000 mm

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SPHERICAL LENSES, MOUNTED

Of optically worked glass; mounted in black plastic circular baffle plate engraved with the focal length of the lens. On diameter 10 mm stem.

Diameter of lens 42mm, white glass.  

 

4448.01 Biconvex lens, mounted f = 50 mm

4448.02Biconvex lens, mounted f = 100 mm

4448.03 Biconvex lens, mounted f = 150 mm

4448.04 Biconvex lens, mounted f = 200 mm

4448.05 Biconvex lens, mounted f = 300 mm

4448.06 Biconvex lens, mounted f = 500 mm

4449.01 Biconcave lens, mounted f = 50 mm

4449.02 Biconcave lens, mounted f = 100 mm

4449.03 Biconcave lens, mounted f = 200 mm

4449.04 Biconcave lens, mounted f = 500 mm

 

 PRISM, CROWN GLASS OPTICALLY WORKED

 4450.10

EQUILATE PRISM

Lenght of triangle side 25 mm, height 25 mm

4450.12

EQUILATE PRISM

Lenght of triangle side 32 mm, height 32 mm

 

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ACRYLIC PLASTIC BLOCKS

For refraction experiments. Clear, polished blocks, free from stria and bubbles; with white back to show the path of the light througt the block. Thickness of blocks is 9.7 mm except 4451.70

 

 

4451.54 Biconvex block

 87 mm Long, 105 mm radius of curvature 

 

4451.56 Biconvex block

  87 mm Long, 63 mm radius of curvature

 

4451.58 Biconvex block

  87 mm Long, 105 mm radius of curvature

 

4451.60 Triangular block

90 45 45, sides 90 x 45 mm

 

4451.62 Circular block

 90 mm Diameter

 

4451.64 Semicircular block

 90 mm Diameter

 

4451.66 Trapezoidal block

with 60 and 45 prism ends.

 

4451.70 Rectangular block

Dimension 75 x 50 x 20 mm

 

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4453.10 SET OF COLOUR FILTERS

Set of seven acetate filters mounted in slide frames. Overall size 50 mm x 50 mm

Apertue size 24 mm x 36 mm

4453.20 NEWTON COLOUR DISK

For the verification of the additive mixture of the spectral colours. The disk is divided into coloured sectors, and when placed in rapid rotation, causes the viewer to perceive the disk as white.Disk diameter 250 mm

4453.45 DOUBLE FISSURE

Climbed on on telaietto by slides, among two lastrines of glass.

Dimensions of the telaietto 50 mms x 50 mms. Space among the two fissures 0,1 mms.

4453.90  PAIR OF POLARIZING FILTERS

Circular filters of diameter 40 mm, mounted in circular baffle plates in black plastic, with diameter 10 mm stem for application to optical bench (cat.4418.00). Baffle plate mounts with 180 scale for reading of polarizing plane to an accuracy of 2.5.

 

 

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152e.tif (37005 byte)

4454.95  DIRECT VISION SPECTROSCOPE

For the examination of absorption and emission spectra, absorption by coloured solutions, etc. Metal body tube 113 mm long x 25 mm diameter with a slit at one end and x 2 eyepiece at the other end, with glass lens and blazed 300 linee/mm grating. Supplied with removable curvette mount and two square-section cuvettes for examination of coloured solutions.

 

Spare parts for 4454.95

 

4454.97

CUVETTES 10X10X45 mm pack of 10

SPECTROMETER

    Readings to 0.1

    Telescope with x 15 Ramsden   eyepiece

   

This robust, easy to use instrument is particulary suitable for the classroom. The graduated disk has 0.5 divisions and is fixed to the table; double ended vernier scale attached to telescope reading to 1' of arc. Telescope and table have fine-adjustment scews, and claing scews; the collimator is mounted on a fixed support. The telescope and collimator are fitted with achromatic objectives with a focal lenght of 178 mm, and a 32 mm clea apertue, with rack and pinion focusing; mounting of telescope and collimator permits precise levelling of optical axes and squaring to axis of rotation. The telescope is fittedwith a x 15 Ramsden eyepiece and crossline graticule which can be oriented with respect to the vertical; the collimator is fitted with a precision slit with variable amplitude.

The spectrometer table is equipped with levelling screws and reference lines to facilitate the correct positioning oh the prism and grating. The spectrometer is supplied complete with basic accessories: dense flint prism; prism clamp; diffraction grating holder: eyeglass for reading of angles; tommy-bar adjustment of optical axis; hardwood case; instruction sheets.

ACCESSORIES AND SPARE PARTS FOR 4455.01

 

4455.03

GAUSS EYEPIECE

For the replacement of the normal eyepiece of the spectrometer when the optical system is to be eligned. Complete with 12V 24W lamp

 

4455.04 Spare lamp for Gauss eyepiece

4455.05 Transformer for Gauss eyepiece 

4455.06 Double-face mirror 

4455.08 Dense flint prism, spare

 

DIFFRACTION GRATING REPLICA

 

Overall size 50 mm x 50 mm

aperture soze 36 x 24 mm

mounted between two glass protecting plates.

4455.10 Diffraction grating, 600 lines/mm

 4455.11 Diffraction grating, 300 lines/mm

 4455.12 Diffraction grating, 80 lines/mm

 4455.13 Diffraction grating, 100 lines/mm

 4455.14 Diffraction grating, 1200 lines/mm

4455.40 PLATINUM WIRE

Glass rod 75 mm long with enclosed platinum wire 38 x 0.4 mm length x diameter; sutable for flame tests.

4455.50 SET OF SALTS FOR FLAME TESTS

For production fo flame spectra to be observed with spectrometer.

The following items are housed on a handy plastic tray:

 

- Porcellain crucible

- Plate of blue glass

- Plate of green glass

- Glass rod with platinum wire

- Glass bottle with stopper

- Bottle of calcium chloride 50g

- Bottle of sodium chloride 75g

- Bottle of lithium chloride 50g

- Bottle of  barium chloride 90g

- Bottle of potassium chloride 50g

- Bottle of  strontium chloride 50g

- Bottle of copper chloride 50g

- Bottle of  lead chloride 50g

- Bottle of  iron chloride 50g

- Bottle of silver chloride 50g

SPECTRUM LAMPS

For the production and observation of the visible spectrum of the gas or  metal vapour contained in the tube.

 

4460.10 Spectrum lamp, cadmium

4460.11 Spectrum lamp, helium

4460.12 Spectrum lamp,mercury

4460.13 Spectrum lamp, sodium

4460.14 Spectrum lamp, neon

 

4460.20 SPECTRUM LAMP HOUSING

 

With cylindrical shield. Mounted on d. 10 mm stem for application to standard base (cat. 2101.10). Complete with cable for connection to transformer

SPECTRUM TUBES FOR SPECTRAL ANALYSIS

 

Straight pattern, to use with holder cat. 4470.50 and high tension power supply unit cat. 2406.04 or 2407.01

4470.10 Spectrum tube, helium

4470.11 Spectrum tube, neon

4470.12 Spectrum tube, argon

4470.13 Spectrum tube, mercury

4470.14 Spectrum tube, hydrogen

4470.15 Spectrum tube, oxygen

4470.16 Spectrum tube, nitrogen

4470.17 Spectrum tube, carbon dioxide

4470.50 SPECTRUM TUBE HOLDER

Comprise of PVC rod on plastic base with sliding supports

 

   

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LASER He - Ne

- EASY TO HANDLE

- POWER SUPPLY UNIT INCORPORATED

- MAY BE MODULATED TO ACOUSTIC FREQUENCIES

- LONG-LIFE

- LOW OPERATING NOISE LEVEL

Our He-Ne laser is a light-weight and complee unit which includes both the laser tube and the power supply unit. The beam is not influenced by room conditions since there is no problem of mirror adjustment which normally render the of laser tedious and time consuming.

TECHNICAL CHARACTERISTICS:

 Wavelenght:  0,6328 m

Mode : TEMoo

Output power : >= 2 mW; +/- in modulation

Polarization: rondom

Warm-up time: 50% when switched on, and 100% within 15 minutes.

Beam diameter at 1/e2 points: approx. 0.59mm 0,3 mW

Divergence: approx. 1.35 mrad

Operating noise (between 1 Hz and 100 kHz) < 0.5% rms

Modulation input impedence: approx. 8 Ω at 1 kHz

Modulation frequency: audio frequencies

Modulation tension: less than 5Vp.p.

Modulation factor: > 2.5% at 1 kHz with modulation tension 4Vp.p.

Operating temperature: 10C - 40C

 

Average tube life: approximately 10.000 hours of corret operation.

Complete with pilot light, mechanical beam shut off, key operated switch, polaroid filter, pair of cockets for modulation entry and mains cable with 19 mm plug.

 

Spare part for 4479.00 

4479.12 Laser tube

THE LASER AS A TEACHING TOOL

 

The laser is a versatile instrument for the school, both from an operational as well as from a teaching viewpoint. It facilitatcs correct and simple experiments with diffraction and interference, witich and in the comprehension of the complex nature of light and its effects on matter. The laser is used because of the spatio-temporal coherence of the light beam, a property which natural light does not posses.

Within the cntext of geometrical optics, the laser supplies a narrow bean of light even over great distances without a decrease of intensity. The fundamental laws of optics may thus be obtained with an accuracy difficult to reach with convetional light sources.

The light bean emitted by the laser may be enlarged by means of a single lens without changing the optical characteristics. Two or more beams may be produced with the use of a beam splitter, and these may be directed onto the desired objects. In this way, for example, 3-dimensional photography (holography) is carried out: holography is presently finding many fields of application.

The extreme coherence and monochromaticy of the laser are proving useful in basic scientific applications and aerospace technology. To cite only one of the many examples, a comunications network based on laser with modulated intensity is being studied as a means of establishing a simple and efficient information trasmission system. The laser beam acts as a support for transmission in the same way as a high-frequency radio wave. In the classroom, this can be repeated using a tape recorder, a photocell, and an amplifier with a loudspeaker.

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ACCESSORIES FOR THE MODULATION OF THE LASER BEAM

For the modulation of the laser beam, it is necessary that information to be transmitted is fed to the power supply unit by an audio amplifier with an output impedance of 4-8 Ω.. The P.G.A. EUROPA SUD low frequency amplifier (cat.2501.03) is suitable for this purpose, together with a microphone (cat.2503.12); other alternatives are a signal generator (cat.2290.03), or tape recorder or radio with output impedance of 4-8Ω. The receiver should be composed of a photocell detector (cat.4480.01) and a second low frequency amplifier (cat. 2501.03)

The laser beam may also be modulated externally to the power supply input, for example, by means of the light reflected from a mirror mounted on a tuning fork.

 

LOW FREQUENCY AMPLIFER WITH BUILT-IN LOUDSPEAKER

(see cat. 2501.03)

 

MOVING COIL MICROPHONE 

(see cat. 2503.12)

 

TUNING FORK ON RESONANCE BOX  (see cat. 4317.30)

MIRROR FOR TUNING FORK

(see cat. 4317.35)

 

LOW FREQUENCY SIGNAL GENERATOR AND AMPLIFIER 

(see cat. 2290.03)

 

4480.01

PHOTOCELL DETECTOR

magnetic attachment, complete with connecting leads. Used for the demodulation of the laser beam, together with amplifier 2501.03

 

ACCESSORIE FOR ABOVE:

4480.02

PHOTOCELL HOLDER

In iron, with securing scew. To be mounted on 10 mm diameter rod.

 

Truncated cone base ( see cat. 2101.10)

  chronium plated brass rod, diameter 10 mm, length 25 cm ( see cat.. 2106.05)

 

 

 

 

ACCESSORIES KIT

 

Slide-frame mounted accessorie (available in kit as cat. 4485.20)

 

 

 

- single tapered slit

- double tapered slit

- diffraction grating, 80 lines/mm

- diffraction grating, 300 lines/mm

- wire gauze

- diaphragm with holes of 1.0mm, 0.62mm, 0.9 mm, 0.29 mm diameter +/- 10%

- series of 6 slides with 1,2,3,4,5 or 6 slits with nominal amplitude of 0.6 mm and separation of 0.2mm

- two polaroid filters

- grating with 40 lines/cm, amplitude of lines 0.20 mm, spacing 0.06mm

- grating with 40 lines/cm, amplitude of lines 0.10 mm, spacing 0.16mm

- grating with 80 lines/cm, amplitude of lines 0.03 mm, spacing 0.10mm

- hologram

 Unmounted accessories

- no. 6 lenses with lens holder

- steel pins and needles with needle holder

- adjustable slit diaphragm

- glass plate

Material for mounted

- 3 slide/lens holder

- package of plasticine

 

The following are among the many experiments that can be performed with this accessories kit:

 

- Interference of two light beams from two slits

- Passage from interference to diffraction

Diffraction by a slit (Fraunhofer)

- Simultaneous diffraction and interference

- Optical activities

- Observation of a hologram

 

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Copyright 1999 ICARO DIDATTICA S.r.l.
Modernized Limited liability company: 14 febbraio 2007