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| 1. |
If the focal length of a lense is -20cm then find the power and nature of the lens |
| Answer» POWER of a lens is always reciprocal to the FOCAL length. So, aconvex lens with 50CM focal length has a power of (1/0.5) Dioptre(D) or 2D. SINCE, a convex lens is a converging lens, THEPOWER of the convex lens is +2D. | |