Question

To get three images of a single object, one should have two plane mirrors at an angle of 

(a) 60° 

(b) 90° 

(c) 120° 

(d) 30°

Answer 1

(b) 90° 

The number of images formed, n = \(\frac{360°}{θ}\) – 1 or 3 =\(\frac{360°}{θ}\) -1 or θ = 90°