Determine the focal length of a thin converging lens if the power is 5.0 dioptres
-
A.
0.1 m -
B.
0.2 m -
C.
2.0 m -
D.
2.5 m
Correct Answer: Option B
Explanation
Power of a lens = (frac{1}{f})
f = focal length
f = (frac{1}{p})
= (frac{1}{5})
= 0.2m
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