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19. A ray of light after being reflected is allowed to fall on a scale. When the reflecting plane mirror is slightly turned, the spot of light is displaced through 0-25 m on the scale. If the distance of the scale fromthe mirror is 100 m; find the angle of rotation of the mirror.IJ.E.E. '04] [Ans. 7-16°)attached to a galvanometer coil |
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