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Light is incident normally on a diffraction grating through which the first order diffraction is seen at . The second order diffraction will be seen at
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a
480
b
640
c
800
d
There is no second order diffraction in this case
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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 sinθ2 will be more than 2×0.5, which is not possible.Similar Questions
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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