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A 30mm wide diffraction grating produces...

A `30mm` wide diffraction grating produces a deviation of `30^@` in the second order principal maxima. The wavelength of light used is `600nm`. The total number of slits in the grating is:

A

(a) `12500`

B

(b) `25000`

C

(c) `11500`

D

(d) `15000`

Text Solution

Verified by Experts

The correct Answer is:
A
`dsintheta=nlambda30^@=2xx600xx10^-9`
or `d=4xx600xx10^-9m`
Let N slits are there in the grating, then `Nd=30mm`
`N=12500`
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