SAT Subject Physics Practice Question 585: Answer and Explanation

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Question: 585


Which letter above represents a 3λ difference in path length?

A. Position A
B. Position B
C. Position C
D. Position D
E. Position E

Correct Answer: E


The correct answer is (E). After the zeroth fringe, each bright spot represents a position of convergence for the two light beams. The bright spots represent the number of whole wavelengths difference in the path length taken by one of the light beams compared to the other light beam.

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