Plane microwaves are incident on a long ...

Plane microwaves are incident on a long slit having a width of 5.0 cm. Calculate the wavelength of the microwaves if the first diffraction minimum is formed at `theta=30^@`.

`2.5cm`

`5cm`

`7.5cm`

`10cm`

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The correct Answer is:

`a sin theta = n lambda`

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