A Convex Spherical Surface with Radius R Separates a Medium

question 36

Multiple Choice

A convex spherical surface with radius r separates 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 distance r/2 from the surface
• B)changes from virtual to real when it is a distance r from the surface
• C)changes from real to virtual when it is a distance r/2 from the surface
• D)changes from real to virtual when it is a distance r from the surface
• E)remains real

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