The focal length of a biconvex pens of refractive index is 3/2 is 40 cm its focal length in metres - Physics -

Question

The focal length of a biconvex pens of refractive index is 3/2 is
40 cm its focal length in metres when immersed in a liquid of
refractive index 4/3 is

Aamish Samotra · Accepted Answer

The focal length of a biconvex pens of refractive index is 3/2 is 40 cm.its focal length in metres when immersed in a liquid of refractive index 4/3 is