An object and a screen are fixed apart along a common axis
PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
An object and a screen are fixed 90cm apart along a common axis. A thin converging lens with focal length 20cm is placed between them. Calculate the two possible distances from the object at which the lens may be positioned so that a sharp image forms on the screen.