A plane glass mirror of thickness 3 cm of material of $μ = \frac{3}{2}$ is silvered on the back surface. When a point object is placed 9 cm from the front surface of the mirror, then the position of the brightest image from the front surface is

9 cm

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11 cm

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12 cm

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13 cm

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Solution

The correct option is C 13 cm
The apparent height of silver ex from front surface is
$\frac{3}{/ x} = μ \Rightarrow x = 2 c m$
$\Rightarrow$ image from front surface $= 9 + 2 + 2 = 13 c m$

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