Geometrical OpticsHard

Question

Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from m to m in 30 seconds. What is the speed of the object in km per hour?

Options

A.2 km/hr.
B.3 km/hr.
C.4 km/hr.
D.5 km/hr.

Solution

= - 10m
From 1st condition
⇒ u1 = 50m
From 2nd condition
⇒ u2 = 25m
Velocity = = 3km / h

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