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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 8 April 2026, Shift 2, Physics Q42

Question 42 of 75 in this shift, Physics question 17 of 25, Section A.

Light ray incident along a vector AO→\overrightarrow{AO} (AO→=2i^−3j^)\left(\overrightarrow{AO} = 2\hat{i} - 3\hat{j}\right) emerges out along vector OB→\overrightarrow{OB} (OB→=Ci^−4j^)\left(\overrightarrow{OB} = C\hat{i} - 4\hat{j}\right) as shown in the figure below. The value of CC is ________.

The figure, in words

Refraction at a horizontal interface; medium above has mu_1 = 1, medium below has mu_2 = 1.5. Ray AO comes in from upper left to point O on the interface, with angle alpha marked between AO and the vertical normal; refracted ray OB goes down to the right with angle beta marked between OB and the normal.
  1. (1)1.6Official answer
  2. (2)0.16
  3. (3)11.6
  4. (4)16

Official answer

Option 1

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Refraction and Snell's Law
Idea tested
Snell's Law Application

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2023, Shift 1 · Q52A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2.15 m within water when sunlight is incident at an…HardNumerical 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 42 of the 174 JEE Main shifts held from 2017 to 2026.