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In a single slit diffraction of light of...

In a single slit diffraction of light of wavelength `lambda` by a slit of width e, the size of the central maximum on a screen at a distance b is

A

(a) `2blambda+e`

B

(b) `(2blambda)/(e)`

C

(c) `(2blambda)/(e)=e`

D

(d) `(2blambda)/(e)-e`

Text Solution

Verified by Experts

The correct Answer is:
C
The direction in which the first minima occurs is `theta` (say). Then `e sin thetalambda` or `etheta=lambda` or, `theta=lambda/e`
(`:' theta=sin theta` when `theta` small)

Width of the central maximum `=2btheta+e=2b*lambda/e+e`
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