A thin lens of refractive index 1.5 has a focal length of 15 cm in air

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A thin lens of refractive index 1.5 has a focal length of 15 cm in air. When the lens is placed in a medium of refractive index

\frac{4}{3}

, what will its focal length be (in cm)?