Question

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

• A. 30$°$
• B. 60$°$
• C. 90$°$
• D. 150$°$

Answer 1

The correct option is C 90$°$

For three images, the angle between two plane mirrors should be (when n is even)
n=360θ-1
where n is the number of images and θ is the angle between two plane mirrors.
⇒ $3=360/\theta -1$

⇒ $\theta =90°$