Question

A bulb is placed between two plane mirrors inclined at an angle of $60^{\circ }$. The number of images formed is

• A. 5
• B. 6
• C. 4
• D. 3

Answer 1

Answer: (A)

$n=\frac{360^{\circ }}{\theta }-1$
Given, $\theta =60^{\circ }$
$\Rightarrow$ $n=\frac{360^{\circ }}{60^{\circ }}-1$
$\Rightarrow$ $n=6-1=5$