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प्रश्न
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 ?
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उत्तर
When white light is incident on the first surface of a prism and enters in glass, light of different colours due to different speeds in glass, is refracted or deviated through different angles. Thus the dispersion of white light into its constituent colours takes place at the first surface of prism.
On the second surface, only refraction takes place and different colours are deviated through different angles. As a result, the colours get further separated on refraction at the second surface (violet being deviated the most and red the least).
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संबंधित प्रश्न
What happens when a ray of ordinary light is passed through a triangular glass prism?
The colour of white light which is deviated the maximum on passing through the glass prism is:
(a) blue
(b) indigo
(c) red
(d) orange
The property of splitting of white light into its seven constituent colours is known as
Out of air and glass, which is optically rarer? Give reason.
Define the term dispersion of light.
Complete the ray diagram given below to show the nature of light produced on the screen.
A wave has wavelength 50Å of name the wave.
State two uses of ultraviolet radiation.
Write an Explanation.
Critical angle
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:
