what will be the focal lenght of a combined lens made by contact of two lenses of power +3D and -2D.

asked May 4, 2022 8.9k views

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2 votes

$\\ \bull\tt\dashrightarrow P=P_1+P_2$

$\\ \bull\tt\dashrightarrow P=+3D-2D=+1D$

Now

$\\ \bull\tt\dashrightarrow f=(1)/(P)$

$\\ \bull\tt\dashrightarrow f=(1)/(1)$

$\\ \bull\tt\dashrightarrow f=1m$

HexBlit answered May 10, 2022

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