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The angle substanded by the first diffra...

The angle substanded by the first diffraction minimum for a point source viewed in the hydrogen line at 1420 MHz with a radio telescope having an aperture of 25 m is:

A

`0.8^@`

B

`0.64^@`

C

`1.2^@`

D

`2.2^@`

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From large distance microwaves fall on a long slit of width 5cm. If the first diffraction minima is obtained at an angle 30^(@) form the direct vision slit line then find the wavelength of the microwaves. [2.5 cm]

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