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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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A beam cf 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 θ, the spot of the light is found to move through a distance y on the scale. The angle θ is given by :

(1)y2x(2)yx(3)x2y(4)xy

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