what is the focal length of the lens ?

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The diameter of a plano convex lens is 6cm and thickness at the centre is 3mm. If the speed of light in the material of the lens is 2×10^8m/s, what is the focal length of the lens ?
18
Nov
The diameter of a plano convex lens is 6cm and thickness at the centre is 3mm. If the speed of light in the material of the lens is 2×10^8m/s, what is the focal length of the lens ? The diameter of a plano convex lens is 6cm and thickness at the centre is 3mm. If [...]
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