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A slit of width a is illuminated by whit...

A slit of width a is illuminated by white light. For red light `(lambda=6500Å)`, the first minima is obtained at `theta=30^@`. Then the value of a will be

A

3250

B

`6.5 xx 10^(-4)mm`

C

`1.3 mu m`

D

`2.6 xx 10^(-4)cm`

Text Solution

Verified by Experts

The correct Answer is:
C
`a sin theta = n lambda`
`rArr a = (lambda)/(sin 30^(@))`
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