Determine the focal length of a thin converging lens if the power is 5.0 dioptres
0.1 m
0.2 m
2.0 m
2.5 m
Correct answer is B
Power of a lens = \(\frac{1}{f}\) f = focal length f = \(\frac{1}{p}\) = \(\frac{1}{5}\) = 0.2m
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