Given u=36 cm, |m|=1.5, object speed 10 cm/s at 53° to the axis—use cos53°=3/5. Find the magnitude of image axial speed in cm/s.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

Given u=36 cm, |m|=1.5, object speed 10 cm/s at 53° to the axis—use cos53°=3/5. Find the magnitude of image axial speed in cm/s.

G1 Physics · Accepted Answer

Object axial speed=6 cm/s. Axial amplification=|m|²=2.25, so image axial speed=13.5 cm/s.