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OpenStudy (anonymous):
plane mirrors A and B are kept at an angle theta with respect to each other. light falls on A, is reflected then falls on B and is reflected. the emergent ray is opposite to the incident direction. then angle theta is equal to....?
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OpenStudy (anonymous):
|dw:1351872827812:dw| answer is 90:)
OpenStudy (anonymous):
@SPIRIT94
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