An object and a screen are fixed 100 cm apart on an optical bench
PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
An object and a screen are fixed 100 cm apart on an optical bench. A thin lens can be placed at two distinct positions along the bench, separated by 21 cm, that each produce a sharp image on the screen. Determine the focal length of the lens, including sign, and state whether the lens is converging or diverging.