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प्रश्न
Explain the cause of dispersion of white light through a prism.
उत्तर
When white light is incident on the first surface of a prism and enters 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 the prism. Thus, the cause of dispersion is the change in the speed of light with wavelength or frequency.
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संबंधित प्रश्न
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
The splitting of white light into its constituent colours is called .............
The diagram below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. If the yellow light is replaced by a narrow beam of white light incident at the same angle, draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.
Refer to fig
(i) Name the lens L.
(ii) What are the points O, O' called?
(iii) Complete the diagram to form the image of the object AB.
(iv) Write three characteristics of the image.
An object AB is placed in front of a convex lens as shown in fig. 4. Complete the ray diagram and obtain the image formed and state the nature of the image.
A wave has wavelength 50Å of State its one use.
When white light enters a glass prism from the air, the angle of deviation is least for ____________.
What is a rainbow?
State the colour which bends:
- The most.
- The least while passing through a glass prism.
