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

84° 48° 64° None of these

None of these

For second order diffraction, $\sin θ_2=\frac{2λ}{d}=2\sin θ_1$ $= 2 \sin 32° > 1$ Which is not possible. Hence there is no second order diffraction.