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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

First bright

B

First dark

C

Second bright

D

Second dark

Text Solution

Verified by Experts

The correct Answer is:
C
For brightness, path difference `= n lamda = 2 lamda` So second is bright.
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Knowledge Check

  • Fig show a double slit experiment, P and Q are the two coherent source. The path lengths PY and QY are n lambda and (n+4)lambda respectively where n is whole number and lambda is wavelength. Taking the central bright fringe as zero, what is fromed at Y ?

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