# 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 , the spot of the light is found to move through a distance y on the scale. The angle is given by : Option 1) Option 2) Option 3) Option 4)

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

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

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

Option 1)

This option is correct.

Option 2)

This option is incorrect.

Option 3)

This option is incorrect.

Option 4)

This option is incorrect.

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