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प्रश्न
State the cause of dispersion of white light
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उत्तर
When a beam of white light enters a prism, it gets refracted at the point and splits into its seven constituent colors, viz. violet, indigo, blue, green, yellow, orange, and red. The acronym for the seven constituent colors of white light is VIBGYOR. This splitting of the light rays occurs because of the different angles of bending for each color and this different angles of bending occur because the different component of light faces different refractive indices when passing through the glass prism.
When a narrow beam of sunlight is allowed to fall on one of the rectangular surfaces of the glass prism, we obtain a colored spectrum with red and violet color at its extreme.
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संबंधित प्रश्न
A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence. On analyzing the ray diagrams, which one of the following conclusions is he likely to draw?
(A) The emergent ray is parallel to the incident ray.
(B) The emergent ray bends at an angle to the direction of the incident ray.
(C) The emergent ray and the refracted ray are at right angles to each other.
(D) The emergent ray is perpendicular to the incident ray.
In the formation of spectrum of white light by a prism:
which colour is deviated most?
Out of air and glass, which is optically rarer? Give reason.
What conclusion do you draw about the nature of white light in part (b)?
Differentiate between a glass slab and a glass prism.
A student has to trace the path of a ray of light through a glass prism. List four precautions he should observe for better results.
Which characteristic property of light is responsible for the blue colour of the sky?
Write the range of wavelength of the visible spectrum.
In the figure, a beam of light consisting of three colours blue, red, and yellow is incident on a prism and on a rectangular glass block respectively. Complete the diagram by drawings of the refracted and emergent rays.
State the colour which bends:
- The most.
- The least while passing through a glass prism.
