Wavelength of Hg Source Using Plane Diffraction Grating
Product Description
Experiments:
To determine the wavelength of any three lines of mercury light by diffraction grating in 1st and 2nd order spectrum.
APPARATUS USED
1. SPECTROMETER
Base : painted base with 3 leveling screws.
Scale : circular scale is graduated 360' in half degrees & is attached to the arm with telescope ,so that it moves when telescope is moved.
Vernier : 30 or 60 divisions of Vernier coincide with 29 (or 59) divisions of the main circular divisions.
Collimator : This horizontal tube has an achromatic lens( 7” F.L.) at one end and a sliding tube with on adjustable vertical slit at the other. The distance between the lens & slit can be changed by a rack & pinion for obtaining parallel rays.
Slit : consists of two sharp edges; one fixed while the other can be moved by a screw provided.
Telescope : it is an astronomical telescope with an achromatic objective of 7” F.L. And a Ramsden's eye piece.
Prism Table : two circular plates separated by 3 springs having leveling screws. Its height can be adjusted by a screw on its side. On its top a grating holder & prism holder is mounted.
Vernier : 60/30sec.
SIZE : 6”prism stand,grating holder
2 Mercury Vapour Lamp 80 watt with choke & wooden box having slits fitted.
3. Micrometer Single Slit ( to be fitted on objective of spectrometer telescope.
4. Diffraction Grating 15000 lines/inch
FEATURES
- Spectrometer 6 inch
- Prism 32 x 32 mm DF
- Diffraction Grating 15000 lines/inch
- Mercury Vapour Lamp with choke & box 80 W
- Single slit with micrometer provided
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