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
Explanation
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°)