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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

`3250Å`

B

`6.5xx10^(-4)mm`

C

`1.24` micro

D

`2.6xx10^(-4)cm`

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The correct Answer is:
C
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