Three lenses of power $+ 1.5 D$ and $- 0.5 D$ are kept in contact on their principal axis. What is the effective power of the combination?

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Solution

$P = P_{1} + P_{2} = + 1.5 - 0.5 = + 1 D$

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Three lenses of power +1.5 D and −0.5 D are kept in contact on their principal axis. What is the effective power of the combination?

P=P1+P2=+1.5−0.5=+1D

Three lenses of power $+ 1.5 D$ and $- 0.5 D$ are kept in contact on their principal axis. What is the effective power of the combination?

$P = P_{1} + P_{2} = + 1.5 - 0.5 = + 1 D$