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A lens of power +2 diopters is placed in contact with a lens of power -1 diopter. The combination will behave like
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The correct answer is:
A convergent lens of focal length $100 \mathrm{~cm}$
$\frac{1}{f}=\frac{1}{f_1}+\frac{1}{f_2}=\frac{P_1}{100}+\frac{P_2}{100}=\frac{1}{100}$
$\Rightarrow f=100 cm$
$\Rightarrow f=100 cm$
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