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14.Two lenses one of focal length 20 cm (Convex lens) and another of focal length -15 cm (concave lens) are placed in contact.Find the power of combination of lens. |
| Answer» 14.Two lenses one of focal length 20 cm (Convex lens) and another of focal length -15 cm (concave lens) are placed in contact.Find the power of combination of lens. | |