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Image of an Extended Object in Plane Mirror

A ray light m...

Question

A ray light makes an angle of $10^{o}$ with the horizontal and strikes a plane mirror which is inclined at $25^{o}$ to horizontal. By what angles should the plane mirror be rotated so that the ray of light will be vertically reflected.

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Solution

The angle by which the plane mirror should be rotated is given by,

$= \frac{10 + 25}{2}$

$= \frac{35}{2}$

$= {17.5}^{\circ}$

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