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

`3250Å`

`6.5xx10^(-4)cm`

`1.3mum`

`2.6xx10^(-4) cm`

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