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  4. If a convex lens of focal length 100 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power

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Q. If a convex lens of focal length $100 \,cm$ and a concave lens of focal length $50 \,cm$ are combined together, what will be their resulting power

Ray Optics and Optical Instruments

Solution:

$P=P_{1}+P_{2}$
$P=\frac{1}{(+1)}+\frac{1}{(-0.5)}$
$P=-1 D$