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| 1. |
A plane convex lens (f 20 cm) is silvered at plane surface. Now f will be a.-20 cm b. -40 cm c. -30 cm d. 10 cm |
| Answer» A plane convex lens (f 20 cm) is silvered at plane surface. Now f will be a.-20 cm b. -40 cm c. -30 cm d. 10 cm | |