A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from…

1. $\frac{y}{2x}$
2. $\frac{y}{x}$
3. $\frac{x}{2y}$
4. $\frac{x}{y}$

Solution

When mirror is rotated by $\theta$ angle reflected ray will be rotated by $2\theta$ .

for small $\text{θ,}$ $\frac{y}{x}=2\theta$
$\theta =\frac{y}{2x}$

Asked in: NEET 2017

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