| ⇦ | 
| ⇨ |
The refracting angle of a prism is A and refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is
Options
(a) 180⁰-3 A
(b) 180⁰-2 A
(c) 90⁰- A
(d) 180⁰+2 A
Correct Answer:
180⁰-2 A
Explanation:
Refractive index, μ = sin (A+Dm / 2) / sin (A/2)
cot (A / 2) = sin (A+Dm / 2) / sin (A/2)
cos (A/2) / sin (A/2) = sin (A+Dm / 2) / sin (A/2)
sin [(π/2) – (A/2)] = sin [(A + Dm) / 2]
(π / 2) – (A / 2) = (A / 2) + (Dm / 2)
Dm = π – 2A
Angle of minimum deviation, Dm = 180° – 2A
Related Questions: - A wire having resistance 12Ω is bent in the form of an equilateral triangle.
- Wavefront is the locus of all points, where the particles of the medium
- Three objects A,B and C are kept in a straight line on a frictionless horizontal surface
- Six molecules have speeds 2 units, 5 units, 3 units, 6 units, 3 units and 5 units
- A disc of moment of inertia (9.8/π²) kg m² is rotating at 600 rpm. If the frequency
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A wire having resistance 12Ω is bent in the form of an equilateral triangle.
- Wavefront is the locus of all points, where the particles of the medium
- Three objects A,B and C are kept in a straight line on a frictionless horizontal surface
- Six molecules have speeds 2 units, 5 units, 3 units, 6 units, 3 units and 5 units
- A disc of moment of inertia (9.8/π²) kg m² is rotating at 600 rpm. If the frequency
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply