A Concave Spherical Surface with Radius R Separates a Medium

question 44

Multiple Choice

A concave spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image:

• A) changes from virtual to real when it is r/2 from the surface
• B) changes from virtual to real when it is 2r from the surface
• C) changes from real to virtual when it is r/2 from the surface
• D) changes from real to virtual when it is 2r from the surface
• E) remains virtual

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