(1) To use laser light of wavelength 632.8 nm to determine the number of grooves on a diffraction grating.

(2) Calculate the groove distance of a diffraction grating from first-order diffraction data.

You will be using a small piece of plastic diffraction grating to spread visible light into its various colors. This amazing little device has thousands of narrowly spaced lines on it. The exact number can be determined by sending light of a single wavelength through it, and measuring the diffraction angle. Then the diffraction equation for constructive interference (derived in the background section) can be used to calculate d, the groove spacing, and from there it is easy to determine the number of grooves per centimeter.

Somewhere in the room there should be a demonstration setup similar to the one pictured below. This setup involves a helium-neon laser, so named because the laser tube I filled with these gases. It emits mainly red light at 632.8 nanometers (nm). The diffraction grating used is the same type that you will be using in the spectroscope that you will build in Section B.

2. Measure the values of a and b at the setup in your room. It many also be possible to observe second-order spots.

You will need these values for your homework, so record them below and in your notebook.

a = 15.15 cm

b = 33.20 cm

Transcribed Image Text:

Side view Top view CHayden-McNeil, LLC Laser Laser sin e opposite hypotenuse = a Grating 0 Card a 2nd Order 1st Order Undiffracted beam 1st Order 2nd Order Side view Top view CHayden-McNeil, LLC Laser Laser sin e opposite hypotenuse = a Grating 0 Card a 2nd Order 1st Order Undiffracted beam 1st Order 2nd Order

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a Calculate the groove spacing d using given equation Here n is integer d is groove spacing q ... View the full answer