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Interference fringes are produced on a s...

Interference fringes are produced on a screen by using two light sources of intensities / and 9/. The phase difference between the beams `pi/2` is at point P and `pi`at point Q on the screen. The difference between the resultant intensities at point P and Q is

A

2I

B

4 I

C

6 I

D

8 I

Text Solution

Verified by Experts

The correct Answer is:
C
`I=I_(1)+I_(2)+sqrt(I_(1)I_(2))2cosphi`
`I_(P)=I+9I+sqrt(I9I)2cos""(pi)/(2)`
`I_(P)=101" "......(i)`
`I_(Q)=I+9I+sqrt(I9I)2cospi`
`I_(Q)=10I-6I=4I" ".......(ii)`
`I_(P)-I_(Q)=10I-4I=6I.`
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