JEE Main & Advanced
Physics
Ray Optics
Question Bank
Refraction at Curved Surface
question_answer
Focal length of a converging lens in air is R. If it is dipped in water of refractive index 1.33, then its focal length will be around (Refractive index of lens material is 1.5) [RPMT 1997; EAMCET (Med.) 1995]