JEE Main & Advanced
Physics
Ray Optics
Question Bank
Numerical Value Type Questions - Optical Instrument
question_answer
A point object is placed at a distance of 25 cm from a convex lens. A glass slab of thickness 15 cm and the\[R.\text{ }I=3/2\]is inserted between lens and object. The image is formed at infinity. Find focal length (in cm) of the lens?