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The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is |
| Answer» The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is | |