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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 25 July 2022, Shift 2, Physics Q38

Question 38 of 90 in this shift, Physics question 8 of 30, Section A.

For an object placed at a distance 2.4 m from a lens, a sharp focused image is observed on a screen placed at a distance 12 cm form the lens. A glass plate of refractive index 1.5 and thickness 1 cm is introduced between lens and screen such that the glass plate plane faces parallel to the screen. By what distance should the object be shifted so that a sharp focused image is observed again on the screeen ?
  1. (1)0.8 m
  2. (2)3.2 mOfficial answer
  3. (3)1.2 m
  4. (4)5.6 m

Official answer

Option 2

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Lens Maker's Formula
Idea tested
Thin Lens Formula

Same idea in other shifts

Asked 4× in all
  1. 9 Apr 2024, Shift 1 · Q45Given below are two statements : Statement (I) : When an object is placed at the centre of curvature of a concave lens, image is formed at…MediumTwo statements
  2. 10 Apr 2023, Shift 2 · Q57A point object, 'O' is placed in front of two thin symmetrical coaxial convex lenses L1L_1 and L2L_2 with focal length 24 cm and 9 cm…MediumNumerical valueHas a figure
  3. 31 Aug 2021, Shift 1 · Q6An object is placed at the focus of concave lens having focal length ff. What is the magnification and distance of the image from the…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.