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Angular width of central maxima is pi//2...

Angular width of central maxima is `pi//2`, when a slit of width 'a' is illuminated by a light of wavelength `7000 Å` then a =

A

`9 xx 10^(-9) m`

B

`8 . 9 xx 10^(-7) m `

C

`9 xx 10^(-7) m `

D

`3 . 5 xx 10^(-7) m `

Text Solution

Verified by Experts

The correct Answer is:
B
` a sin theta = n lambda , a = (lambda)/(sin theta) = w = 2 theta theta = (w)/(2)`
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