According to the law of refraction, when a light enters from a denser medium into to rarer medium, it turns away from the normal' Let consider a light from an object O in the denser medium is passing through a rarer medium as shown in the figure. The ray will pass through Following the laws of refraction. The other rays incident at different angle of incidence will similarly follow the path. If the angle of incidence become greater than a certain value (called critical angle ). The ray will reflect back to the first medium and no portion of the light beyond this critical value will pass through the second medium, This is called Total Internal Reflection
\n\n
Thus Total internal reflection is the phenomenon of reflection of light into a denser medium from an interface of this denser medium and a rarer medium.
\n\n
The essential conditions for the total internal refection are :
\n\n
(1)The light should travel from denser medium to rarer medium
\n\n
(2) The angle of incidence in the denser medium should be greater than the critical angle of the pair of media in contact
\n\n
The refractive index and the critical angle are related with the equation :.
\n\n
\n\n"},"comment":{"@type":"Comment","text":"The total internal reflection takes place when the incident angle is more than the critical angle."},"encodingFormat":"text/markdown","learningResourceType":"Practice problem","suggestedAnswer":[],"text":"Explain total internal reflection from the laws of refraction."},"name":"Quiz on Refraction of Light","typicalAgeRange":"10-17","url":"https://www.embibe.com/questions/Explain-total-internal-reflection-from-the-laws-of-refraction./EM8765676"}
Embibe Experts Solutions for Chapter: Refraction of Light, Exercise 1: West Bengal Board-2018
Author:Embibe Experts
Embibe Experts Physics Solutions for Exercise - Embibe Experts Solutions for Chapter: Refraction of Light, Exercise 1: West Bengal Board-2018
Attempt the free practice questions on Chapter 13: Refraction of Light, Exercise 1: West Bengal Board-2018 with hints and solutions to strengthen your understanding. Previous Years' Solved Papers: Physics West Bengal Board 12 solutions are prepared by Experienced Embibe Experts.
Questions from Embibe Experts Solutions for Chapter: Refraction of Light, Exercise 1: West Bengal Board-2018 with Hints & Solutions
A ray of light is incident at a small angle on a rectangular glass slab of thickness . If the refractive index of the glass slab is , show that the perpendicular distance between the emergent ray from the slab and the incident ray is .