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Two plane mirrors are inclined at an angle of $60^\circ$. The number of images of a point object placed between them is:
A$3$
B$4$
C$5$
D$6$
Answer & Solution
Correct answer: C. $5$
When $360^\circ/\theta$ is an integer, the number of images is $n = \dfrac{360^\circ}{\theta} - 1$. Here $360^\circ/60^\circ = 6$, an integer, so $n = 6 - 1 = 5$.
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