Question

A: In Young's double slit experiment white light is used and slits are covered with red and blue filters respectively. The phase difference at any point on the screen will continuously change and uniform illumination is produced on the screen.

R: Two independent sources of light would no longer act as coherent sources.

• A. Both A and R are true, and R is correct explanation of A
• B. Both A and R are true, and R is not correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A Both A and R are true, and R is correct explanation of A

As red and blue filters will allow only red and blue light to pass through which are completely different frequencies.
Because of different frequencies, the phase difference changes continuously and there will be uniform illumination produced on the screen.
Thus statement A is true.

Statement R is true because red and blue light act as two independent sources and the coherence is broken down when sources are independent.
Thus statement R explains statement A.