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[" 35.A beam of light from a source "L" ...

[" 35.A beam of light from a source "L" is incident "],[" normally on a plane mirror fixed at a certain "],[" distance "x" from the source.The beam is "],[" reflected back as a spot on a scale placed "],[" just above the source L.When the mirror "],[" is rotated through a small angle "theta," the spot "],[" of the light is found to move through a "],[" distance "y" on the scale.The angle "theta" is given "],[" by: "],[[" a) "(y)/(x)," b."(x)/(2y)," C."(x)/(y)," d."(y)/(2x)," ( "(y)/(2x)]]

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