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प्रश्न
What is dispersion? Explain in detail.
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उत्तर
- Splitting white light into its seven constituent colours (wavelength), on passing through a transparent medium is known as dispersion of light.
- Dispersion occurs because the light of different colours present in white light have different wavelength and they travel at different speeds in a medium.
- The refraction of a light ray in a medium depends on its speed.
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संबंधित प्रश्न
A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.
(i) Write the name and cause of the phenomenon observed.
(ii) Where else in nature is this phenomenon observed?
(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.
A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
(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?
What will happen if another similar glass prism is placed upside down behind the first prism?
The speed of light in air or vacuum is
State the speed of light in (a) air, (b) water, and (c) glass
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:
(A) is parallel to the incident ray
(B) perpendicular to the incident ray
(C) is parallel to the refracted ray
(D) bends at an angle to the direction of incident ray
Write the range of wavelength of the ultraviolet spectrum.
Curved mirrors have surfaces that are spherical, cylindrical, parabolic, and ellipsoid.
