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

A

`3250 Å`

B

`6.5xx10^(-4)mm`

C

`1.24` microns

D

`2.6xx10^(-4)cm`

Text Solution

Verified by Experts

The correct Answer is:
B
For first minima, `d sin theta=lambda/2 or d=lambda/(2sin theta)`
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