Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination?

A. 30°
B. 45°
C. 60°
D. 90°

Correct Answer: Option A

A. 30°

Explanation

Formula for number of images = 360/n−1

where n is the angle of inclination.

Given the number of images = 11, we have

360/n−1 =11
360/n=12
n=360/12=30°