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Electronics and Communication Engineering - Communication Systems - Discussion

Discussion Forum : Communication Systems - Section 25 (Q.No. 13)
Communication Systems
13.
Which of the following statements is correct?
Convex lens has positive focal power and concave lens have negative focal power
Convex lens has negative focal power and concave lens have positive focal power
All lens have positive focal power
All lens have negative focal power
Answer: Option
Explanation:
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