A small lightbulb is slowly moved along the principal axis toward a concave mirror
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics
Problem
A small lightbulb is slowly moved along the principal axis toward a concave mirror, starting from a very large object distance. At which region does the image change from real to virtual?
(a) When the bulb is closer than f to the mirror
(b) Precisely when the bulb is at distance 2f from the mirror
(c) Precisely when the bulb is at distance f from the mirror
(d) When the bulb is between 2f and f from the mirror