A source of light is located at double the focal length from a convergent lens
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A source of light is located at double the focal length from a convergent lens. The focal length of the lens is f=30cm. At what distance from the lens should a flat mirror be placed so that rays reflected from the mirror are parallel after passing through the lens for the second time?