A point source of light is placed on the principal axis between F and 2F of a concave lens
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics
Problem
A point source of light is placed on the principal axis between F and 2F of a concave lens. On the other side very far, a screen is placed perpendicular to principal axis. As the screen is brought close towards lens
(a) the light intensity on screen continuously decreases
(b) the light intensity on screen continuously increases
(c) the light intensity on screen first increases, then decreases
(d) the light intensity on screen first decreases, then increases