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Saturday, 31 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 11 April 2023, Shift 2, Physics Q56

Question 56 of 90 in this shift, Physics question 26 of 30, Section B.

As shown in the figure, a plane mirror is fixed at a height of 50 cm50\ \mathrm{cm} from the bottom of tank containing water (μ=43)\left(\mu = \frac{4}{3}\right). The height of water in the tank is 8 cm8\ \mathrm{cm}. A small bulb is placed at the bottom of the water tank. The distance of image of the bulb formed by mirror from the bottom of the tank is ____________ cm.

The figure, in words

Vertical tank with a plane mirror at the top, fixed 50 cm above the bottom of the tank (marked by a 50 cm dimension arrow); water of height 8 cm (marked 8 cm) at the bottom; a small bulb (dot) at the bottom of the tank.

Official answer

98

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. 6 Apr 2024, Shift 2 · Q50In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale division…HardSingle correct
  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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.