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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 3 August 2021, Shift 1, Physics Q17

Question 17 of 90 in this shift, Physics question 17 of 30, Section A.

A compound microscope has a magnification of 30. Assuming that the final image is formed at the least distance of distinct vision (25 cmcm), find the magnification produced by the objective lens of the microscope. Given focal length of the eye piece is 5 cmcm.
  1. (1)4
  2. (2)5Official answer
  3. (3)3
  4. (4)2

Official answer

Option 2

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Optical Instruments
Idea tested
Compound Microscope Magnification

Same idea in other shifts

Asked 2× in all
  1. 4 Sep 2020, Shift 1 · Q24In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. The focal length of its…HardNumerical value

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 108 of the 174 JEE Main shifts held from 2017 to 2026.