A single slit of width a is illuminated ...

A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm.The value of a' for which first minimum appears at `theta`=`30^@` on the screen will be:

1.2 `mu` m

0.6 `mu` m

3 `mu` m

1.8 `mu` m

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