Discussion :: Communication Systems
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Which of the following statements is correct?
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A.
Convex lens has positive focal power and concave lens have negative focal power
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B.
Convex lens has negative focal power and concave lens have positive focal power
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C.
All lens have positive focal power
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D.
All lens have negative focal power
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Answer : Option A
Explanation :
No answer description available for this question.
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