A point object in air is placed 30 cm in front of a convex spherical surface separating air from glass of refractive index 1.50. The radius of curvature of the surface is +30 cm. Using the Cartesian sign convention, determine the image distance from the pole.
Options

Question

A point object in air is placed 30 cm in front of a convex spherical surface separating air from glass of refractive index 1.50. The radius of curvature of the surface is +30 cm. Using the Cartesian sign convention, determine the image distance from the pole.

Options

G1 Physics · Accepted Answer

Use μ₂/v − μ₁/u = (μ₂−μ₁)/R. Thus 1.50/v − 1/(-30) = (1.50−1)/30. Solving gives v = -90.00 cm.