Two thin lenses of power +3 D and -1 D are kept in contact. The net po…

Question

Two thin lenses of power +3 D and -1 D are kept in contact. The net power is:

Accepted Answer

C. +2 D

1. Powers of lenses in contact add algebraically.
2. P_net = P₁ + P₂ = (+3) + (-1) = +2.
3. The combination behaves as a single converging lens of +2 D.
_Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.4.4_

Answer

-2 D

Answer

+4 D

Answer

+3 D

Two thin lenses of power +3 D and -1 D are kept in contact. The net power is:

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