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°
Verified Correct Answer: A.
Physical Principles & Numerical Solution
Formula for number of images = \(\frac{360}{n} - 1\)
where n is the angle of inclination.
Given the number of images = 11, we have
\(\frac{360}{n} - 1 = 11\)
\(\frac{360}{n} = 12\)
\(n = \frac{360}{12} =30^\circ\)
Source: Myschool Past Questions Archive (Record #49731)