JEE Main 2022 Physics question

The power of a lens (biconvex) is 1.25 in particular medium. Refractive index of the lens is 1.5 and radii of curvature are 20 cm and 40 cm respectively. The refractive index of surrounding medium

(1)1.0
(2)9/7Correct
(3)3/2
(4)4/3

Answer: (2)

Solution

1/f = . With 1/f = 1.25 and (1/20 + 1/40) =

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Question ID VK-034641