At an instant a concave mirror has transverse magnification −2. An object has axial speed 3 cm/s and transverse speed 4 cm/s. Find the magnitude of image velocity in cm/s.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

At an instant a concave mirror has transverse magnification −2. An object has axial speed 3 cm/s and transverse speed 4 cm/s. Find the magnitude of image velocity in cm/s.

G1 Physics · Accepted Answer

Axial image speed magnitude=|m|²×3=12 cm/s. Transverse image speed magnitude=|m|×4=8 cm/s. Resultant=√(144+64)=√208≈14.42 cm/s.