Two lenses of powers $-1.75 \mathrm{D}$ and $+2.25 \mathrm{D}$ are placed in contact. The focal length of the combination is

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Aicharya · Accepted Answer

$\mathrm{P}=\mathrm{P}_1+\mathrm{P}_2=-1.75+2.25=0.5 \mathrm{D}$ $\begin{aligned} & \Rightarrow \frac{1}{\mathrm{f}_{	ext {net }}}=0.5 \ & \Rightarrow \mathrm{f}_{	ext {net }}=2 \mathrm{~m}=200 \mathrm{~cm}\end{aligned}$

Two lenses of powers $-1.75 \mathrm{D}$ and $+2.25 \mathrm{D}$ are placed in contact. The focal length of…

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