question_answer

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror \[\left( {{M}_{1}} \right)\] and parallel to the second mirror \[({{M}_{2}})\] is finally reflected from the second mirror \[({{M}_{2}})\] parallel to the first mirror\[\left( {{M}_{1}} \right)\]. The angle between the two mirrors will be:   [JEE Main Online Paper (Held On 09-Jan-2019 Evening]

A) \[60{}^\circ \]             

B) \[75{}^\circ \]

C) \[45{}^\circ \]             

D)               \[90{}^\circ \]

Correct Answer: A

Solution :

  \[2\theta +\theta =180\] \[\theta =60{}^\circ \] Option [a]