A slit of width is illuminated by white ...

A slit of width is illuminated by white light. For red light `(lambda=6500Å)`, the first minima is obtained at `theta=30^@`. Then the value of will be

`3250 Å`

`6.5 xx 10^(-4) mm`

1.24 microns

`2.6 xx 1^(-4)cm`

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