1.

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 :

Answer»

`84^(@)`
`48^(@)`
`64^(@)`
None of these.

Solution :`d SIN theta = n lambda therefore (lambda)/(d) = sin theta_(1) = sin 32^(@)`
for n = 2, `theta = theta_(2)`
`therefore sin theta_(2) = (2 lambda)/(d) = 2 sin theta_(1) = 2 sin 32^(@) gt 1`. This is not possible so SECOND order diffraction is not occuring.


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