A point source of light is placed in front of a plane mirror as shown in the figure. Determine ...

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A point source of light is placed in front of a plane mirror as shown in the figure.

Determine the length of reflected path of light on the screen \( \Sigma \).
(1) \( L \)
(2) \( 2 L \)
(3) \( 3 L / 2 \)
(4) \( L / 2 \)
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