First slide

Ray optics

Question

A plane mirror is approaching you with $10 {cms}^{- 1}$ you can see your image in it. At what speed will your image approach you?

Moderate

A

$10 c {ms}^{- 1}$
B

$15 cm s^{- 1}$
C

$20 cm s^{- 1}$
D

$25 cm s^{- 1}$

Solution

${\vec{v}}_{I} = - {\vec{v}}_{o} + 2 {\vec{v}}_{m} = - 0 + 2 (10)$
$= 20 cm s^{- 1}$

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