2
Instruction sheet
3B SCIENTIFIC
®
PHYSICS
U19511 Grating 600 lines/mm
U19512 Grating 300 lines/mm
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:
38 mm x 50 mm
Size of grating:
24 mm x 24 mm
No. of lines:
300 resp. 600 lines / mm
Grating constant:
3,3 µm resp. 1,7 µm
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.
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
1
= 21°.
A: Light source
B: Collimator
C: Grating
D: Observation tube
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible
C
B
A
θ
D
θ
1
