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प्रश्न
Answer the following:
What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.
उत्तर
- The phenomenon of splitting of light into its component colours is called dispersion of light.
- In the spectrum of light splitting of white light into different colours takes place. Various colours obtained in spectrum of light are in the sequence - Violet, Indigo, Blue, Green, Yellow, Orange and red.
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संबंधित प्रश्न
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
Study the following ray diagram:
In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by
(A) y, p, z
(B) x, q, z
(C) p, y, z
(D) p, z, y
State the cause of dispersion of white light
(i) 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.
(ii) Mark the least deviated colour in your diagram
(iii) Why do different coloured rays deviate differently in a prism?
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.
How could you show that the colours of the spectrum combine to give white light?
What acts as tiny prisms in the formation of a rainbow?
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
The splitting of white light into its constituent colours is called .............
Out of air and glass, which is optically rarer? Give reason.
A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.
In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ?
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
A wave has wavelength 50Å of State the speed in vacuum.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
Assertion: We can see the rainbow in the sky when the rain starts falling after a spell of bright sunlight.
Reason: The rainbow is formed due to the dispersion of light.
State the colour which bends:
- The most.
- The least while passing through a glass prism.
A ray of light is incident at 45° on an equilateral prism in the diagram below.
- Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
- State the cause of the above phenomenon mentioned by you.
