Image of an object approaching a convex mirror of radius of curvature 20m slong its
Channel: Doubtnut
Date: 05/07/2020

Image of an object approaching a convex mirror of radius of curvature 20m slong its optical axis is observed to move from `(25)/(3)`m to `(50)/(7)`m in 30 seconds. What is the speed of the object in km per hour?