A beam of light from a source \( L \) is incident normally on a pla...

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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
\( \mathrm{P} \) the source. The beam is reflected back as a spot on

W 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) \( \frac{y}{x} \)
(b) \( \frac{x}{2 y} \)
(c) \( \frac{x}{y} \)
(d) \( \frac{y}{2 x} \)
(NEET)
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