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प्रश्न
What is total internal reflection?
Explain total internal reflection of light.
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उत्तर
Total internal reflection is the phenomenon when a ray of light travelling in a denser medium is incident at the surface of a rarer medium such that the angle of incidence is greater than the critical angle for the pair of media, and the ray is totally reflected back into the denser medium.
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संबंधित प्रश्न
You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will
(a) deviate a pencil of white light without much dispersion,
(b) disperse (and displace) a pencil of white light without much deviation.
Angle of deviation is the angle which the ______ ray makes with the direction of ______ray.
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.
Calculate the speed of light in a medium whose critical angle is 30° ?
The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles].
A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
How is the angle of emergence ‘e’ related to the angle of incidence ‘i’?
What is meant by the statement, ‘the critical angle for diamond is 24°’?
How is the critical angle of a material related to its refractive index?
Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.
Complete the following diagram to show the path of the ray of a single colour in the diagram as if enters in and emerges out of the prism. Mark the angles wherever necessary. (Critical angle for glass = 42°).
Choose the correct option.
Select the WRONG statement.
Answer the following question.
Why is prism binoculars preferred over traditional binoculars? Describe its working in brief.
Total internal reflection can take place only if light is travelling from ______.
The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.
What is a mirage? How does it occur?
A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement.
The angle made by incident ray of light with normal of the reflecting surface is called ______.
Name any two phenomena which take place in the formation of a rainbow.
When a ray of light is refracted from one medium to another, then the wavelength changes from 6000 Å to 4000 Å. The critical angle for the interface will be ______.
