Question

Two plane mirrors are inclined to each other at angle $60{}^\circ$ . Ray incident on first mirror parallel to the second mirror becomes parallel to first mirror after reflection. Angle of deviation is

• A. $30{}^\circ$
• B. $60{}^\circ$
• C. $90{}^\circ$
• D. $120{}^\circ$

Answer 1

Answer: (D)

$120{}^\circ$

Answer 2

The angle of deviation $={{180}^{o}}-{{60}^{o}}$ $={{120}^{o}}$