NEET UG 2018 · Physics · Question 19
NEET 2018 Physics, question 19
Question 19 of the NEET 2018 paper (code AA) is a Physics question from Ray Optics and Optical Instruments. Its idea, Snell's Law Calculation, was asked twice, in 2018 and 2021, across NEET 2017–2026. The CBSE official answer key gives option 2.
Updated 2026-10-08
Q19 · Physics
The refractive index of the material of a prism is and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
- 130°
- 245°Official answer
- 360°
- 4zero
Official answer: option 2 · CBSE official answer key
Same idea
Snell's Law Calculation, in other papers
NEET asked this idea twice, in 2018 and 2021. The other question below.
- 2021 Q30Find the value of the angle of emergence from the prism. Refractive index of the glass is .Figure-based · Medium
Snell's Law Calculation: 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. Snell's Law alone had 8.