Question

State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.

Answer 1

(a) Angle between the mirrors,  θ = 90^o

Now, n = 360^o / θ^o = 360^o / 90^o = 4, which is even.

Hence number of images formed will be (n-1); i.e., 4 - 1 = 3 images

(b) Angle between the mirrors,  θ = 60^o

Now, n = 360^o / θ^o = 360^o / 60^o = 6, which is even.

Hence number of images formed will be (n-1); i.e., 6-1 = 5 images