Question

A glass paper-weight (n = 1.5) of radius 3 cm has a tiny air bubble trapped inside it. Closest distance of the bubble from the surface is 2 cm. Where will it appear when seen from the other end (from where it is farthest)?

Answer 1

From figure, distance OR = 2 cm

∴ Distance OP = 4 cm

According to sign conventions,

OP = u = -4 cm and CP = R = -3 cm

For refraction at curved surface,