Question:

A biconvex lens of refractive index 1.5 has a focal
length of 20 cm in air. Its focal length when
immersed in a liquid of refractive index 1.6 will
be: 

(1) – 16 cm 

(2) – 160 cm 

(3) + 160 cm 

(4) + 16 cm

                                        JEE-2024       

Solution:                
A biconvex lens of refractive index 1.5 has a focal length of 20 cm in air. Its focal length when immersed in a liquid of refractive index 1.6 will be: (1) – 16 cm (2) – 160 cm (3) + 160 cm (4) + 16 cm JEE-2024

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