An object and a concave mirror of focal length 20 cm

Last updated: 6/9/2023

An object and a concave mirror of focal length 20 cm approach each other with a speed of 1 cm s and 2 cm sec respectively At the instant when the object is at a distance of 15 cm from the mirror the speed of image is 1 50 cm sec 3 16 cm sec 2 18 cm sec 4 8 cm sec