8. The focal length of a convex lens 25 cm, then what is its power? A+ 2.5 D B. +5.0D C. + 4.0 D D. +10.0 D.
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Answer:
P=f1
f=25cm=0.25m
P=0.251=4D
Since, it is a convex lens, the power is positive. Thus, P=+4D
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