Q.

In the Young's double slit experiment, the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is

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a

π2

b

π6

c

π3

d

π4

answer is C.

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Detailed Solution

I=751004I0;4I0cos2ϕ/2=344I0cos2ϕ/2=34;cos2ϕ/2=32 ϕ/2=π3rad

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In the Young's double slit experiment, the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is