Advertisements
Advertisements
प्रश्न
Write an Explanation.
Critical angle
Advertisements
उत्तर
For a particular value of i (angle of incidence) for which, the value of r (angle of refraction) becomes equal to 90°, is called the critical angle.
APPEARS IN
संबंधित प्रश्न
In the following diagram, the path of a ray of light passing through a glass prism is shown:
In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):
(A) X, R and T
(B) Y, Q and T
(C) X, Q and P
(D) Y, Q and P
Describe an activity to show that colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.
In the formation of spectrum of white light by a prism:
which colour is deviated most?
Fill in the blank with suitable word:
When a ray of light enters a prism, it bends ................ the normal ; as it leaves the prism, it bends ................. the normal.
What will happen if another similar glass prism is placed upside down behind the first prism?
How could you show that the colours of the spectrum combine to give white light?
Name the process which is involved in the formation of a rainbow.
How does the speed of light determine the optical density of a medium?
You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its colour when it is rotated rapidly?
Define the term dispersion of light.
Explain briefly, with the help of a neat labelled diagram, how white light gets dispersed by a prism. On which surface of a prism, there is both dispersion and deviation of light, and on which surface of the prism, there is only deviation of light ?
The wavelength range of white light is ______.
Draw a labelled diagram: Dispersion of light through a prism.
Which characteristic property of light is responsible for the blue colour of the sky?
Distinguish between an impure spectrum and a pure spectrum.
The process of separation of light into its component colours while passing through a medium is called _______.
During dispersion of white light by prism placed in air, for a particular value of angle of prism,
______ colour is deviated the least in the spectrum of white light obtained with a glass prism.
State the colour which bends:
- The most.
- The least while passing through a glass prism.
