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

`3250Å`

`6.5xx10^(-4)cm`

`1.3mum`

`2.6xx10^(-4) cm`

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