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प्रश्न
How could you show that the colours of the spectrum combine to give white light?
उत्तर
We know that a spectrum of colours is formed when a beam of white light is passed through a transparent glass prism. These colours can be recombined to give white light again. This is achieved by placing another glass prism upside down behind the first prism. A patch of white light is obtained on a screen placed behind the second prism because the refraction produced by the second prism is equal and opposite to the refraction produced by the first prism.
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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.
Draw a ray diagram to explain the term angle of deviation.
Define the term dispersion of white light.
As light rays emerge from a glass prism into air, are they refracted towards or away from the normal?
A beam of white light is shone onto a glass prism. The light cannot be:
(a) deviated
(b) dispersed
(c) focused
(d) refracted
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
If white light is used in same way what change is expected in the emergent beam?
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.
State two uses of ultraviolet radiation.
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| The wavelength of red light | (a) 600 nm |
| (b) 700 nm | |
| (c) 500 nm |
