# Find the radii of curvature of a convexo- concave convergent lens made of glass with refractive index n-1.5 having focal length of 24cm. One of the radii of curvature is double the other.

Using formula: Lens Maker’s Formula: f = focal length

R1 = radius of curvature of the lens surface closer to the source of light

R2 = radius of curvature of the lens surface farther to the source of light

n = Refractive index

Given: focal length (f) = 24 cm

One of the radii of curvature is double the other that is if R1 = R then R2 = 2R

n = Refractive index = 1.5

For convexo-concave lens both the radii are positive.    2R = 0.5 × 24

R = 12/2 = 6cm

R1 = R = 6 cm

R2 = 2R = 12 cm

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