Topic: Magnification, power of lens, combination of thin lenses· Optics

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (p) and magnification (m) for each lens will be, respectiv…

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (\(p\)) and magnification (\(m\)) for each lens will be, respectively -

1. \(4p\) and \(4m\)

2. \(p^4\) and \(4m\)

3. \(4p\) and \(m^4\)

4. \(p^4\) and \(m^4\)

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Answer: 3. \(4p\) and \(m^4\)

Key idea: powers of thin lenses in contact add, while magnifications of successive images multiply.

Power: \(P=p+p+p+p=4p\).
Each lens magnifies the image formed by the previous one, so \(M=m\times m\times m\times m=m^4\).

This matches option 3 only.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (p) and magnification (m) for each lens will be, respectiv…

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