Physics, asked by akritikumari3110, 1 year ago

Derive an expression for the equivalent focal length of two lenses placed at a cirtain distance

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Answered by Anonymous
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Answer:

Consider two lenses L1 and L2 separated by a small distance 'd' apart, as shown below.

A ray of light AB initially parallel to the principal axis hits the lens L1 and deviates and then hits lens L2. now, for the combination of the two lenses let F be the combined focal length.

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