Dear student,

We have the Lens Formula as:

1/f = 1/v – 1/u
where f= focal length
v = image distance
u = object distance

There is a relation between radius of curvature and focal length given by the Lens Maker’s Formula.

1/f = (₁μ₂ – 1) (1/ R₁ – 1/R₂)
where f = focal length
1μ₂ = μ₂/ μ₁ = refractive index of the second medium / refractive index of the first medium
R₁ = radius of curvature of the first refracting surface of the lens
R₂ = radius of curvature of the second refracting surface of the lens.

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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