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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceAssertion–reasonMediumConceptual

JEE Main 26 February 2021, Shift 2, Physics Q2

Question 2 of 90 in this shift, Physics question 2 of 30, Section A.

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R. Assertion A : For a simple microscope, the angular size of the object equals the angular size of the image. Reason R : Magnification is achieved as the small object can be kept much closer to the eye than 25 cm and hence it subtends a large angle. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both A and R are true and R is the correct explanation of AOfficial answer
  2. (2)Both A and R are true but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is true

Official answer

Option 1

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Optical Instruments
Idea tested
Visual Angle and Angular Magnification

Same topic in other shifts

All Optical Instruments questions
  1. 4 Apr 2026, Shift 1 · Q44A telescope with objective diameter RR is used to observe a distant star emitting light of wavelength 500500 nm, at a resolution of…EasySingle correct
  2. 5 Apr 2026, Shift 1 · Q42A compound microscope is designed with two symmetric biconvex lenses. The objective lens is cut vertically, creating two identical…HardSingle correct
  3. 8 Apr 2023, Shift 1 · Q45In a reflecting telescope, a secondary mirror is used to:EasySingle correct
  4. 27 Jul 2022, Shift 1 · Q46A microscope was initially placed in air (refractive index 1). It is then immersed in oil (refractive index 2). For a light whose…MediumSingle correct
  5. 28 Jul 2022, Shift 1 · Q46In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the…EasySingle correct
  6. 3 Aug 2021, Shift 1 · Q17A compound microscope has a magnification of 30. Assuming that the final image is formed at the least distance of distinct vision (25…MediumSingle correct

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.