Physics · Geometrical Optics

JEE Main 2026 — 24 January, Evening Shift — Question 28

Five persons $\mathrm{P}_{1}, \mathrm{P}_{2}, \mathrm{P}_{3}, \mathrm{P}_{4}$ and $\mathrm{P}_{5}$ recorded object distance (u) and image distance (v) using same convex lens having power +5 D as $(25,96),(30,62)$ , $(35,37),(45,35)$ and $(50,32)$ respectively. Identify correct statement

Option A:
Readings recorded by all persons are correct
Option B:
Reading recorded by $P_{3}$ persons are incorrect
Correct
Option C:
Reading recorded by $P_{3}$ and $P_{2}$ persons are incorrect
Option D:
Reading recorded by $\mathrm{P}_{4}$ and $\mathrm{P}_{5}$ persons are incorrect

Answer: B

Step-by-step solution

$\mathrm{P}=+5 \mathrm{D}$ $\frac{1}{\mathrm{f}}=5 \Rightarrow \mathrm{f}=20 \mathrm{~cm}$ ⇒ If object is between f & 2f image will be beyond 2f & magnified. ⇒ If object is beyond 2f, image will be between f & 2f & diminished. Hence reading of $\mathrm{P}_{3}$ are incorrect.

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Exam: JEE Main 2026
Paper: 24 January, Evening Shift
Subject: Physics
Chapter: Geometrical Optics
Topic: Lenses and Their Combinations, Silvering of Lens

Distance between an object and three times magnified real image is 40 cm . The focal length of the mirror used is \ \ \ \ cm .

Answer: B

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