JEE Main 20208 Jan, Morning shiftPhysicsMediumOptics190× since 2002
A point object in air is in front of the curved
surface of a plano-convex lens. The radius of
curvature of the curved surface is 30 cm and
the refractive index of the lens material is 1.5,
then the focal length of the lens (in cm)
is ______.