Diffraction Gratings - The Wavelength of Light
PHY 201 & 231
Lab PDF 1Lab PDF 2
In this experiment, the students will separate a light source into its component wavelengths using diffraction gratings. The students will make a series of measurements on a mercury light source to determine the value of the grating spacing. This value will then be used to determine the wavelengths of a helium source.
Equipment
| Name | Location | Quantity |
| Rods, Clip | JE-105A-D24 | 2 per table |
| Gratings | JE-105A-D28 | 1 per table |
| Light Bulbs | JE-105A-D15, S143 | 1 per table |
| Meter Stick - 1.00m | JE-105A-(105 Door), D98 | 1 per table |
| Optics Bench Rod | JE-105A (Next to File Cabinet) | 1 per table |
| Clamp, Optics Bench | JE-105A-D30, D31 | 3 per table |
| Optics, Bench End Supports | JE-105A-D36 | 2 per table |
| Ruler, SAFE-T | JE-105A-D90 | 2 per table |
| Spectral Tube Power Supply | JE-105A-S145 | 1 per table |
| Spectral Tubes, Helium | JE-105A-S145 | 1 per table |
| Spectral Tubes, Mercury | JE-105A-S145 | 1 per table |
| Flashlights, 2/D | JE-105A-S154 | 1 per table |
| Lab Jack | JE-105A-S38 | 1 per table |
| Aperture | JE-105A-D28 | 1 per table |
| Paper | JE-105A-S64,65 | 20 per table |
| Protractor | JE-105A-D90 | 2 per table |
| Tape, Masking | JE-105A-D71 | 1 per table |
Notes
Put one He and one Hg spectral tube on each lab bench. The single slit apertures are used in this lab. Put out diffraction gratings that can be held by a clip rod. Rest the spectral tube power supplies on upside down, empty hooked mass holders. These are found on shelf X36. Once the meter stick is held by the clip rod and leveled by the lab jack, tape down the end of the meter stick to the lab jack.
Leave a set of printer paper on the lab instructor's table.
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