NEET UG 2020 · Physics · Question 140
NEET 2020 Physics, question 140
Question 140 of the NEET 2020 paper (code E1) is a Physics question from Ray Optics and Optical Instruments. Its idea, Thin Prisms and Dispersion, was asked twice, in 2017 and 2020, across NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q140 · Physics
A ray is incident at an angle of incidence on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is , then the angle of incidence is nearly equal to :
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- 3Official answer
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Official answer: option 3 · NTA final answer key
Same idea
Thin Prisms and Dispersion, in other papers
NEET asked this idea twice, in 2017 and 2020. The other question below.
- 2017 Q44A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of…Numerical · Medium
Thin Prisms and Dispersion: every question and how it was framed
The chapter
Ray Optics and Optical Instruments in ten years of NEET
26 questions from 2017–2026, asked in 10 of 10 papers, about 2.5 a paper. Prisms, Dispersion and Optical Instruments alone had 8.