The focal length of combination of lenses formed with lenses having power of +2.50 D and -3.75 D , will be

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Aicharya · Accepted Answer

$\begin{aligned} & P=P_1+P_2 \ & =2.50+(-3.75) \ & =2.50-3.75 \ & =-1.25 \mathrm{D} \ & 	herefore \quad \mathrm{f}=\frac{1}{\mathrm{P}}=\frac{1}{-1.25}=-0.8 \mathrm{~m} \ & 	herefore \quad \mathrm{f}=-80 \mathrm{~cm} \end{aligned}$

The focal length of combination of lenses formed with lenses having power of +2.50 D and -3.75 D , will be

Solution