The refractive index of a converging lens is 1 . 4 . What will be the focal length of this lens if it is placed in a medium of same refractive index ? (Assume the radii of curvature of the faces of lens are R 1 and R 2 respectively)

Question

The refractive index of a converging lens is 1 . 4 . What will be the focal length of this lens if it is placed in a medium of same refractive index ? (Assume the radii of curvature of the faces of lens are R 1 and R 2 respectively), 1, Infinite, R 1 R 2 R 1 - R 2, Zero

MARKS App · Accepted Answer

1 F = μ L μ S - 1 1 R 1 - 1 R 2 If μ L = μ S ⇒ 1 F = 0 ⇒ F = ∞

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