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3B SCIENTIFIC® PHYSICS

Instruction sheet

6/03 ALF

Transmission grating for spectroscopic examinations

and for experiments on diffraction and interference.

Suitable to resolve the Na-D lines.

1. Safety instructions

• To avoid scratching or soiling the surface of the

grating, hold the slide only by its edges.

2. Description, technical data

Gratings with 300 resp. 600 lines per mm, mounted on

glass carrier. Both gratings have a high resolution

power, provide a sharp, bright spectrum and are suit-

able for use in precision spectrometers such as spec-

trometer-goniometer U14416.

The 300 line grating U19512 enables particularly well

measurements to be taken of the separation of Na-D

lines.

Dimensions:

Size of grating:

No. of lines:

Grating constant:

3. Operation

Note: The grating has a stronger spectrum on one side.

For best results mount the diffraction grating in such

a way, that the grating faces the light source.

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible

U19511 Grating 600 lines/mm

U19512 Grating 300 lines/mm

38 mm x 50 mm

24 mm x 24 mm

300 resp. 600 lines / mm

3,3 µm resp. 1,7 µm

3.1 Demonstration of diffraction by a grating

•

Mount diffraction grating in holder (e.g. Multi-

component holder U21810)

•

Grating must be brought into a parallel beam of

light.

•

Diffraction can be observed.

3.2 Use of a spectrometer and goniometer

•

Mount diffraction grating in holder of spectro-

meter-goniometer.

•

Adjust the angles according to illustration.

•

View the light diffracted by the line grating

through the spectrometer telescope. Diffraction

of higher order can be observed.

•

If a sodium lamp is used, the doublet may be

viewed when θ = 10,5° and θ

A: Light source

B: Collimator

C: Grating

D: Observation tube

= 21°.