Physics · Geometrical Optics

NEET (UG) 2025 — Question 12

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

Option A:
$4 P$ and $4 m$
Option B:
$P^{4}$ and $4 m$
Option C:
$4 P$ and $m^{4}$
Correct
Option D:
$P^{4}$ and $m^{4}$

Answer: C

Step-by-step solution

For four identical thin convex lenses in contact, the net power is the sum of individual powers: $P_{\text{net}} = P + P + P + P = 4P$ . The total magnification is the product of individual magnifications: $m_{\text{net}} = m \times m \times m \times m = m^4$ . Thus the combination has power $4P$ and magnification $m^4$ , which corresponds to option C.

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Exam: NEET (UG) 2025
Paper: 2025 paper
Subject: Physics
Chapter: Geometrical Optics
Topic: Miscellaneous Problems for different combinations

A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of…

Answer: C

Step-by-step solution

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