A concave mirror forms a real image with magnification −4. The object is shifted until the magnification becomes −2. If |f|=24 cm, find the magnitude of object displacement in centimetres.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

A concave mirror forms a real image with magnification −4. The object is shifted until the magnification becomes −2. If |f|=24 cm, find the magnitude of object displacement in centimetres.

G1 Physics · Accepted Answer

u₁=f(1+1/4)=30 cm; u₂=f(1+1/2)=36 cm. Displacement=6 cm.