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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 27 July 2022, Shift 2, Physics Q53

Question 53 of 90 in this shift, Physics question 23 of 30, Section B.

A thin prism of angle 6∘6^\circ and refractive index for yellow light (nY\mathrm{n_Y})1.5 is combined with another prism of angle 5∘5^\circ and nY=1.55\mathrm{n_Y}=1.55. The combination produces no dispersion. The net average deviation (δ\delta) produced by the combination is (1x)∘\left(\frac{1}{x}\right)^\circ. The value of xx is ___________ .

The figure, in words

Two thin prisms P1 (apex angle A1 = 6 degrees) and P2 (apex angle A2 = 5 degrees) placed with opposite orientation forming a parallelogram; ray enters P1, emerges from P2 with net deviation delta marked against the dotted undeviated direction.

Official answer

4

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Prism Deviation
Idea tested
Achromatic Prism Combination

Same idea in other shifts

Asked 2× in all
  1. 16 Mar 2021, Shift 2 · Q29A deviation of 2∘2^\circ is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive…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.