Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.
-
A.
17 -
B.
18 -
C.
19 -
D.
20
Correct Answer: Option A
Explanation
The number of images formed = (frac{360}{n}) where the value gotten is odd
else, = (frac{360}{n} -1).
Solving, we have that (frac{360}{20} = 18)
Hence, the no of images formed is 18 – 1 = 17.