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

A slit of width a is illuminated by white light. The first minimum for red light `(lambda=6500 Ã…)` will fall at `theta = 30^(@)` when a will be

A

`3250Å`

B

`6.5xx10^(-4)cm`

C

`1.3mum`

D

`2.6xx10^(-4)cm`

Text Solution

Verified by Experts

The correct Answer is:
C
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