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A slit of width a is illuminiated by whi...

A slit of width a is illuminiated by white light. The first diffraction minimum for light of `lamda=6500 `Å is formed at `theta=30^(@)`, then the width (a) of the slit is

A

`3250Å`

B

`6.5xx10^(-4)cm`

C

`1.3mum`

D

`2.6xx10^(-4)cm`

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The correct Answer is:
C
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