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प्रश्न
Observe the given diagram and answer the questions:
- Name the process shown in the figure.
- Name the colour that deviates the most.
- Name the colour that deviates the least.
- Name any one phenomenon in nature which is based on the above process.
- Define ‘spectrum’.
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उत्तर
- The process shown in the figure is the dispersion of light.
- The colour that deviates the most is violet.
- The colour that deviates the least is red.
- One phenomenon in nature based on the above process is the formation of a rainbow.
- A spectrum is a band of colours, as seen in a rainbow, produced by the separation of the components of light by their different degrees of refraction according to wavelength.
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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.
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :
(A) ∠i and ∠r
(B) ∠i and ∠e
(C) ∠i, ∠e and ∠D
(D) ∠i, ∠r and ∠e
Define the term dispersion of white light.
What will happen if another similar glass prism is placed upside down behind the first prism?
Describe how you could demonstrate that white light is composed of a number of colours.
Which is refracted most by a prism : red light or violet light? Explain why?
The coloured light having the maximum speed in glass prism is:
(a) blue
(b) green
(c) violet
(d) yellow
The property of splitting of white light into its seven constituent colours is known as
You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its colour when it is rotated rapidly?
Define the term dispersion of light.
A wave has wavelength 50Å of State the speed in vacuum.
The phenomenon of splitting of light into its component colours is ___________ .
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.
The splitting of white light into its component colours is called ____________.
What is a rainbow?
During dispersion of white light by prism placed in air, for a particular value of angle of prism,
State the colour which bends:
- The most.
- The least while passing through a glass prism.
