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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^@`.

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The correct Answer is:
B, C
For first minimum diffraction `bsinphi=lamda`
Here `theta=30^@,b=5cm`
`=5/2=2.5cm`
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