A convex spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real:
A) always
B) never
C) only if it is close to the surface
D) only if it is far from the surface
E) only if the radius of curvature is small

Question

Quizplus · Accepted Answer

A real image is formed when light rays converge. For a convex surface with a higher refractive index on the object side, a real image is formed when the object is far from the surface, beyond the focal point.

A Convex Spherical Refracting Surface Separates a Medium with Index