A Convex Spherical Refracting Surface Separates a Medium with Index

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 its distance from the surface is large compared to the radius of curvature
E) only if the radius of curvature is small

Correct Answer:

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