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Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm

Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of the light in material of lens is 2 x 108 m/s, the focal length of the lens is in this Q how to find radius of curvature
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for planoconvex  lens

1/f = (u-1)/R

u= refractive index= c/v

c is speed of light and v is speed of light in medium

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