First slide

Plane mirror

Question

Find the number of images of point source S formed by combination of three plane mirrors as shown in the figure.

Moderate

Solution

$\begin{array}{l} T h e n u m b e r o f i m a g e s f o r m e d b y c o m b i n a t i o n o f t w o p l a n e m i r r o r s = \frac{360^{0}}{60^{0}} - 1 = 5 \\ S i n c e, 3 i m a g e s a r e c o m m o n . \\ T o t a l n u m b e r o f i m a g e s = (5 \times 3) - 3 = 12 \end{array}$

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