A contact lens is made of plastic with an index of refraction of 1.45. The lens has an outer radius of curvature of 1.92 cm and an inner radius of curvature of 2.40 cm. What is the focal length of the lens

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

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Why does lightning travel from clouds to the ground?