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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 6 April 2024, Shift 2, Physics Q50

Question 50 of 90 in this shift, Physics question 20 of 30, Section A.

In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale division = 49 MSD; 20 divisions on main scale in each cm For mark on paper MSR = 8.45 cm, VC = 26 For mark on paper seen through slab MSR = 7.12 cm, VC = 41 For powder particle on the top surface of the glass slab MSR = 4.05 cm, VC = 1 (MSR = Main Scale Reading, VC = Vernier Coincidence) Refractive index of the glass slab is :
  1. (1)1.24
  2. (2)1.42Official answer
  3. (3)1.35
  4. (4)1.52

Official answer

Option 2

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Refraction and Snell's Law
Idea tested
Apparent Depth and Shift

Same idea in other shifts

Asked 4× in all
  1. 11 Apr 2023, Shift 2 · Q56As shown in the figure, a plane mirror is fixed at a height of 50 cm50\ \mathrm{cm} from the bottom of tank containing water…HardNumerical valueHas a figure
  2. 12 Apr 2023, Shift 1 · Q46An ice cube has a bubble inside. When viewed from one side the apparent distance of the bubble is 12 cm. When viewed from the opposite…MediumSingle correct
  3. 30 Jul 2022, Shift 2 · Q22A ring is placed at the bottom of a trough containing four immiscible liquids of refractive indices 1.0, 2.0, 3.0 and 4.0 poured one above…MediumNumerical 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.