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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 :

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When mirror is rotated by an angle \Theta then reflected ray will be rotated by an angle 2\Theta

\therefore 2\Theta = \frac{y}{x}

\therefore \Theta = \frac{y}{2x}


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