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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 27 July 2022, Shift 1, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

A microscope was initially placed in air (refractive index 1). It is then immersed in oil (refractive index 2). For a light whose wavelength in air is λ\lambda, calculate the change of microscope's resolving power due to oil and choose the correct option.
  1. (1)Resolving power will be 14\frac{1}{4} in the oil than it was in the air.
  2. (2)Resolving power will be twice in the oil than it was in the air.Official answer
  3. (3)Resolving power will be four times in the oil than it was in the air.
  4. (4)Resolving power will be 12\frac{1}{2} in the oil than it was in the air.

Official answer

Option 2

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Optical Instruments
Idea tested
Numerical Aperture and Oil Immersion

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