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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
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :
(A) ∠i and ∠r
(B) ∠i and ∠e
(C) ∠i, ∠e and ∠D
(D) ∠i, ∠r and ∠e
In the following diagram the correctly marked angles are :
(a) ∠A and ∠e
(b) ∠i, ∠A and ∠D
(c) ∠A ∠r and ∠e
(b) ∠A ∠r and ∠D
As light rays pass from air into a glass prism, are they refracted towards or away from the normal?
In the formation of spectrum of white light by a prism:
which colour is deviated most?
Which of the following coloured light has the least speed in glass prism?
(a) violet
(b) yellow
(c) red
(d) green
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
When white light passes through a prism, it ............
State the speed of light in (a) air, (b) water, and (c) glass
Explain the cause of dispersion of white light through a prism.
- A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
- If white light is used in the same way as in part (a) above, what change do you expect in the emergent beam?
- What conclusion do you draw about the nature of white light in part (b)?
A wave has wavelength 50Å of State its one use.
The phenomenon of splitting of light into its component colours is ___________ .
How can the presence of ultraviolet radiation be detected?
The process of separation of light into its component colours while passing through a medium is called _______.
What is dispersion? Explain in detail.
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
Why do we see a rainbow in the sky only after rainfall?
______ 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.
