Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32°. The second order diffraction will be seen at

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48°

64°

80°

There is no second order diffraction in this case

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detailed solution

Correct option is D

For a grating (e+d)sinθn=nλwhere (e + d) = grating element sinθn=nλ(e+d)For n = 1, sinθ1=λ(e+d)=sin32°This is more than 0.5. Now sinθ will be more than 2×0.5, which is not possible.

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Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32°. The second order diffraction will be seen at

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