Question

144. A beam of light from a source L is incident normallyon a plane mirror fixed at a certain distance x fromthe source. The beam is reflected back as a spot ona scale placed just above the source L. When themirror is rotated through a small angle θ, the spot ofthe light is found to move through a distance y onthe scale. The angle θ is given by
(1) y/2x (2) y/x
(3) x/2y (4) x/y

Answer 1

Answer:

the answer x/2y

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