Q. A room (cubical) is made of mirrors. An insect is moving along the diagonal on the floor such that the velocity of image of insect on two adjacent wall mirrors is $10\ cms^{- 1}$. The velocity of image of insect in celling mirror is
A) $10\ cms^{- 1}$
B) 20 $cms^{- 1}$
C) $\frac{10}{\sqrt{2}}cms^{- 1}$
D) $10\sqrt{2}\ cms^{- 1}$
Explanation
(d) $v\cos{45{^\circ}} = 10\ v = 10\sqrt{2}\ cms^{- 1}$
In the ceiling mirror be original velocity will be seen
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.