Two mirror are inclined at an angle O as shown in the figure.
Light rays is incident parallel to one of the mirrors. Light will
start retracing its path after third reflection if:
(1) 0 = 45°
(2) 0 = 30°
(3) 0 = 60°
(4) all three
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Answer:
60°
Explanation:
light will retrace it's path if total angle of deflection is 360°.
On one reflection the deflection is 120° so it will retrace its path after 3 reflections.
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