Red laser light from a he-ne laser (λ = 632.8 nm) creates a second-order fringe at 53.2° after passing through the grating. what is the wavelength λ of light that creates a first-order fringe at 22.0°?

Explanation:

It is given that,

Wavelength of red laser light,

The second order fringe is formed at an angle of,

For diffraction grating,

, n = 2

The wavelength λ of light that creates a first-order fringe at 22 is given by :

Hence, this is the required solution.

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