Question

derive an expression for the deviation formed by the combination of two plane mirrors​

Answer 1

Explanation:

If i be the angle of incidence, r be the angle of reflection,

δ=π−(π−2i−2r)

Hence, δ=2i+2r

Also, using the sum of angles of a triangle, i+r−θ=0

Thus, δ=2θ

Which means, that the deviation is independent of either the angle of incidence and also the angle of relection. It only depends on the angle between the mirrors