Jee Advanced
Geometrical Optics
IIT-JEE 2010 Paper 2 Offline
INTEGER+3 / -02010
Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from \({{25} \over 3}\) m to \({{50} \over 7}\) m in 30 s. What is the speed of the object in km per hour?