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
a
48°
b
64°
c
80°
d
There is no second order diffraction in this case
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.Talk to our academic expert!
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In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum
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