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Which of the following statements is correct?

Which of the following statements is correct?

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: convex lens has positive focal power and concave lens have negative focal power

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