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The figure shows a double slit experimen...

The figure shows a double slit experiment with P and Q as the slits. The path lengths PX and QX are `nlambda` and `(n+2)lambda` respectively, where n is a whole number and `lambda` is the wavelength. Taking the central fringe as zero, what is formed at X?

A

(a) First bright

B

(b) First dark

C

(c) Second bright

D

(d) Second dark

Text Solution

Verified by Experts

The correct Answer is:
C
For brightness, path difference `=nlambda=2lambda`
So second is bright.
`I_(max)=(a_1+a_2)^2`, `I_(min)=(a_1-a_2)^2implies(I_(min))/(I_(max))=1/4`
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