MENU

The refracting angle of a prism is A and refractive index of the material of the prism

The Refracting Angle Of A Prism Is A And Refractive Physics Question

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:

  1. Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
  2. If doubly ionised lithium atom is hydrogen like with atomic number 3, the wavelength
  3. The potential differences across the resistance, capacitance and inductance
  4. Kirchoff’s I law and II laws of electricity prove respectively the
  5. A circular disc X of radius R is made from an iron plate of thickness t and another disc

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*