You are provided with two lenses of focal lengths 10cm and 20cm. Which of the two lenses would you suggest to obtain greater convergence on refracted light? Justify your choice.
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Given that,
$f_1=10 cm=0.1 m$
$f_2=20 cm=0.2 m$
Power of convergence is given by,
$p=\frac{1}{f}$
So, $\frac{1}{0.1}=10 D$
$p_2=\frac{1}{0.2}=5 D$
Since $p _1> p _2$
So the lens with focal length 10 cm has greater convergence of refracted light.
$f_1=10 cm=0.1 m$
$f_2=20 cm=0.2 m$
Power of convergence is given by,
$p=\frac{1}{f}$
So, $\frac{1}{0.1}=10 D$
$p_2=\frac{1}{0.2}=5 D$
Since $p _1> p _2$
So the lens with focal length 10 cm has greater convergence of refracted light.
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