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A point source of light is placed in front of a plane mirror as shown in the figure, the length of reflecting path of light on the screen

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3L/2

L/2

answer is C.

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Detailed Solution

From figure
Question Image
$\begin{array}{l} \frac{SO}{OP} = \frac{PM}{RM} \\ RM = 2 L \dots \dots \dots \dots (1) \\ \frac{ST}{TQ} = \frac{QM}{MN} \\ MN = \frac{L}{2} \\ RN = MR - MN = \frac{3 L}{2} \end{array}$

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