Question

A point source of light is placed in front of a plane mirror as shown in Figure.
Determine the length of reflected path of light on the screen `Sigma`

A. L
B. 2L
C. `3L//2`
D. `L//2`

Answer 1

Correct Answer - C
Ray diagram is as shown in figure
Here, `(SO)/(OP)=(PM)/(RM)rArrRM=2L`
Also, `(ST)/(TQ)=(QM)/(SM)rArr SM=(L)/(2)`
`RS=RM-SM=(3L)/(2)`