Question

Two plane mirrors are inclined at some angle, a ray of light incidents on one mirror also gets reflected by second mirror. If the incidence ray and final reflected ray are parallel to each other. What is the angle between those two mirrors?
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Answer 1

Answer:

A ray incident on one mirror at incidence angle theta after reflection falls on the second mirror and is reflected from there parallel to the first mirror, The value of theta is. ∴(θ)=50∘

Answer 2

Solution attached.

Now a short way to quickly do this question within seconds.

Angle of deviation (δ) : It is the angle by which a light ray gets deviated from it's original path.

(Let's not get into proofs,use your own brain miss buddhiya xD or you can góogle it,if interested)

So,if you simply know the angle of deviation, you can find the angle θ between the mirrors by :

$\sf{(δ) = 2θ}$

So, here δ = 180°

So, putting in the values

→ 180° = 2θ

→ θ = 180/2

→ θ = 90°

I have helped a buddhiya twice today, bhagwan kee kuch jaayda hee kripa hone wali h mujhpe :P