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The focal length of a convex lens is 20 cm. Its power is:...
Physics
Ray Optics and Optical Instruments
Question
Updated
24 Aug 2026
The focal length of a convex lens is 20 cm. Its power is:
A
Choose Your Answer
A
+5 D
B
–5 D
C
+0.05 D
D
–0.05 D
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