Question

What will happen when a convex lens is dipped in to a liquid of refractive index less than that of lens?

Answer 1

When the lens is immersed in the liquid it disappears. If a concave-convex lens (refractive index=1.5) is submerged in water (refractive index =1.33), what is the nature of the lens? Why does focal length become infinity if a convex lens is dipped in liquid of the same refractive index