Question

A convex lens of f = 25 cm & concave lens of f = 10 cm are combined. Determine net power​

Answer 1

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Answer 2

$P1=\frac{1}{25}\\P1=0.04D$

[∵ we always take F of concave lens as '-'ve negative]

$P2=\frac{1}{-10}=\frac{-1}{10}\\P2=-0.1D$

∴ net power $=P1+P2$

$=0.04+(-0.1)\\=-0.06D$