Explain why, for points on the screen making a small angle (in radians) with the…

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

Explain why, for points on the screen making a small angle θ\theta (in radians) with the central axis in a double-slit experiment, the path difference between the two waves can be approximated as dθd\theta, where dd is the slit separation.

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