JEE Main · Physics · Ray Optics and Optical Instruments
Prism Refractive Index
JEE Main asked Prism Refractive Index 3 times in 3 of the 108 shifts Lumi analysed, in 2022, 2025 and 2026. It belongs to Prism Deviation, in Ray Optics and Optical Instruments (Physics). The longest wait between two years asking it was 3 years.
Updated 2026-10-24
- Times asked
- 3
- in 3 shifts
- Years
- 3 of 8
- First asked
- 2022
- last in 2026
- Pattern
- Frequent
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2022, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 1 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Single correct is the usual form. Skill tested: calculation.
- Refractive index from minimum deviation
- Angle of incidence at minimum deviation
Difficulty
1 of the 3 questions had a numerical answer.
Every question
All 3 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 6 Apr 2026, Shift 2 · Q42Angle of minimum deviation is equal to the half of the angle of prism in an equilateral prism. The refractive index of the prism is…EasySingle correct
- 2 Apr 2025, Shift 2 · Q49A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to . The refractive index of…EasyNumerical value
- 28 Jun 2022, Shift 1 · Q42The refracting angle of a prism is A and refractive index of the material of the prism is cot (A/2). Then the angle of minimum deviation…MediumSingle correct
Shifts: 28 Jun 2022, Shift 1, 2 Apr 2025, Shift 2, 6 Apr 2026, Shift 2.
Same topic
Other ideas in Prism Deviation
Prism Deviation has 9 ideas JEE Main has asked; 4 of them came up in more than one question.
- Minimum Deviation Condition9× · 2026
- TIR at Second Face Condition2× · 2026
- Achromatic Prism Combination2× · 2022
- Angular Dispersiononce · 2024
- Liquid-Filled Equilateral Prismonce · 2023
- Grazing Emergence Conditiononce · 2022
- Base Parallel Property at Minimum Deviationonce · 2021
- Prism in Surrounding Mediumonce · 2021