JEE Main 20203 Sep, Evening shiftPhysicsMediumOptics190× since 2002
When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a
distance of 10 cm from the mirror. If the object is moved with a speed of 9 cms^–1, the speed
(in cms^–1) with which image moves at that instant is ____.