A converging lens has ω₁=0.020, f₁=+30 cm. It is combined with a diverging lens of ω₂=0.030. Find f₂ for first-order achromatism.
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Question

A converging lens has ω₁=0.020, f₁=+30 cm. It is combined with a diverging lens of ω₂=0.030. Find f₂ for first-order achromatism.

G1 Physics · Accepted Answer

ω₁/f₁+ω₂/f₂=0, so f₂=-45.00 cm.