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प्रश्न
Write an Explanation.
Critical angle
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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.
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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
Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are
(a) ∠A and ∠i
(b) ∠A, ∠i and ∠r
(c) ∠A, ∠i, ∠e and ∠D
(d) ∠A, ∠i, ∠r and ∠D
State the cause of dispersion of white light
- A ray of white light breaks up into its components while passing through a glass prism. Draw a ray diagram to show the path of rays.
- Mark the least deviated colour in your diagram.
- Why do different coloured rays deviate differently in a prism?
What happens when a ray of ordinary light is passed through a triangular glass prism?
What will happen if another similar glass prism is placed upside down behind the first prism?
What acts as tiny prisms in the formation of a rainbow?
The seven colours in the spectrum of sunlight in order, are represented as :
Out of air and glass, which is optically rarer? Give reason.
In figure AO is the ray of white light falling on a prism PQR. Complete the diagram till the light emerges out from the prism and falls on the screen.
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?
In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ?
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
Make the correct choice for each of the following:
Which one of the following Fig correctly shows the path of the ray through the glass block?
Differentiate between a glass slab and a glass prism.
Which characteristic property of light is responsible for the blue colour of the sky?
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
Curved mirrors have surfaces that are spherical, cylindrical, parabolic, and ellipsoid.
What is a rainbow?
The angle of deviation through a prism is minimum when
- Incident rays and emergent rays are symmetric to the prism.
- The refracted ray inside the prism becomes parallel to its base.
- The angle of incidence is equal to that of the angle of emergence.
- When the angle of emergence has doubled the angle of incidence.
Choose the correct answer from the options given below:
