NEET · Physics —

Ray Optics and Optical Instruments appeared 2 times across 1 year — 4.4% of Physics. This question is from Prism Refraction and Angle of Deviation.

Year 2024 Total
Questions 2 2
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A ray of monochromatic light is passing through an equilateral prism (ABC) as shown in the figure. The refracted ray (QR) is parallel to its base (BC) and the angle of incidence (i) is 50° . Then the angle of deviation ( δ ) is:
Prism Refraction and Angle of Deviation diagram for Q23 - NEET 2026 Code 12
Equilateral prism showing light ray incident at angle i and emerging at angle e with internal ray parallel to base.

Solution & Explanation

Related Formula
i + e = A + δ
Core Logic

Since ray QR is parallel to base BC, i = e = 50°.

Prism geometry solution diagram for Q23
Equilateral prism showing light ray incident at angle i and emerging at angle e with internal ray parallel to base.

For equilateral prism, A = 60°.

δ = 2i - A = 2(50°) - 60° = 40°
Pattern Recognition

Parallel internal ray in prism corresponds to minimum deviation condition.

Chapter Mix

Class 12 Physics: Ray Optics and Optical Instruments

Reference Study Guides

Ray Optics And Optical Instruments

More Ray Optics and Optical Instruments Previous-Year Questions

Q19 neet_2024_05_may_morning Concave Lens Refraction
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:
  • A. emerges parallel to the principal axis.
  • B. appears to diverge from the first principal focus.
  • C. passes through 2F, which is the radius of curvature of the lens.
  • D. passes through the second principal focus.

Solution

Related Formula
(1)/(f) = (n-1)((1)/(R₁) - (1)/(R₂))
Core Logic

For a concave lens, parallel incident rays diverge after refraction.

Concave lens ray diagram solution for Q19
Concave lens ray diagram solution for Q19

They appear to diverge from the principal focus on the incident side.

Pattern Recognition

Diverging property of concave lens.

Chapter Mix

Class 12 Physics: Ray Optics and Optical Instruments

More Ray Optics and Optical Instruments Questions — neet_2024_05_may_morning

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Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)