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

`3250 A^(0)`

`1.3` micron

`6.5 xx 10^(-4)` mm

`2.6 xx 10^(-4)m`

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