his is made of glass of An equic refractive index 1 5 and

Last updated: 5/29/2023

his is made of glass of An equic refractive index 1 5 and has a focal length of 10 cm in air The lens is cut into two equal halves along a plane perpendicular to its principal axis to yield two plano convex lenses The two pieces are glued such that the convex surfaces touch each other If this combiantion lens is immersed in water of refractive index 4 3 its focal length in cm is 3 20 4 40 1 5 2 10 85