A convex lens mode of glass (refractive index =1.5) has focal length 24 cm in air. When it is totally immersed in water (refractive index = 1.33)

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

 A convex lens mode of glass refractive index = 1.5 has focal length 24 cm in air. When it is totally immersed in water (refractive index = 1.33), its focal length changes to

(1) 72 cm 

(2) 96 cm

 (3) 24 cm 

(4) 48 cm

                                                             (JEE-2025)

✅ Answer

A convex lens mode of glass refractive index = 1.5 has focal length 24 cm in air. When it is totally immersed in water (refractive index = 1.33), its focal length changes to

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