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Q. |
Which of the following statements is correct? |
A. | convex lens has positive focal power and concave lens have negative focal power |
B. | convex lens has negative focal power and concave lens have positive focal power |
C. | all lens have positive focal power |
D. | all lens have negative focal power |
Answer» A. convex lens has positive focal power and concave lens have negative focal power |
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