Problem: A commercial diffraction grating has 400 lines per mm. When a student shines a 490 nm laser through this grating, how many bright spots could be seen on a screen behind the grating.

FREE Expert Solution

Diffraction:

dsinθ=mλ

m is the order while d is the spacing of the grating.

The number of spots for a given order:

n=2m + 1

θ = 90° for the total number of bright spots.

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Problem Details

A commercial diffraction grating has 400 lines per mm. When a student shines a 490 nm laser through this grating, how many bright spots could be seen on a screen behind the grating.

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