Question

A convex spherical surface with radius rseparates a medium with index of refraction 2 from air. As an object in air is moved toward the surface from far away along the central axis, its image:
A) changes from virtual to real when it is a distancer/2 from the surface
B) changes from virtual to real when it is a distancerfrom the surface
C) changes from real to virtual when it is a distancer/2 from the surface
D) changes from real to virtual when it is a distancerfrom the surface
E) remains real

Answer

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