JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 3 August 2021, Shift 2, Physics Q15

Question 15 of 90 in this shift, Physics question 15 of 30, Section A.

To view a small object with angular magnification 5, the power of the microscope needed is [The final image is formed at infinity] (Distance of distinct vision = 25 cm)

(1)5 D
(2)10 D
(3)20 DOfficial answer
(4)25 D

Official answer

Option 3

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Optical Instruments
Idea tested: Simple Microscope Magnification

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.