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

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11 votes

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

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

Now

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

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

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

Pahnev answered Oct 8, 2022

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