The image of an illuminated square is obtained on a screen with the help of a…
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics
Problem
The image of an illuminated square is obtained on a screen with the help of a converging lens. The distance of the square from the lens is 40 cm. The area of the image is 9 times that of the square. What is the focal length of the lens?
(1) 36 cm
(2) 27 cm
(3) 60 cm
(4) 30 cm