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A convex 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 r 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 r from the surface
E. remains real
A convex 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 r 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 r from the surface
E. remains real
D. changes from real to virtual when it is r from the surface