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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 A

B

`6.5 times 10^-4`

C

`1.24 mu m`

D

`2.6 times 10^-4`

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The correct Answer is:
C
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