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| 1. |
Two lenses A and B have focal length of `+20` cm and, `-10` cm, respectively. a) What is the nature of lens A and lens B? b) What is the power of lens A and lens B? What is the power of combination if lenses A and B are held close together? |
| Answer» a) Lens A is convex, Lens B is concave b) Power of lens A`=+5 D`, Power of lens B`=-10 D` c) `-5D` | |