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Two point sources are placed on a straig...

Two point sources are placed on a straight line separated by a distance `d = 3 lambda`. Both the sources are placed at a distance L from a wall which is perpendicular to the straight line. Both the sources are sending waves of equal intensity.
Find:
a. Locus of the points on the wall having equal intensity.
b. Maximum and minimun path difference observed on the wall.

Text Solution

Verified by Experts

As shown in the figure, path difference between the waves is same in the circular path on the wall. Hence, locus of the points of same intensity is a circle.
Maximum path difference will be at `O = 3 lambda`.
Minimum path difference will be at a large distance from O and it will be zero.
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