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प्रश्न
Why do we see a rainbow in the sky only after rainfall?
“We see a rainbow in the sky only after the rainfall.” Why?
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उत्तर
Raindrops present in the atmosphere after rainfall serve as a prism and refract, disperse, and internally reflect the incident sunlight, followed by final refraction. The whole sequence of dispersion and internal reflection leads to the formation of the rainbow after rainfall in the sky.
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संबंधित प्रश्न
In the following diagram, the path of a ray of light passing through a glass prism is shown:
In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):
(A) X, R and T
(B) Y, Q and T
(C) X, Q and P
(D) Y, Q and P
As light rays emerge from a glass prism into air, are they refracted towards or away from the normal?
Fill in the blank with suitable word:
When a ray of light enters a prism, it bends ................ the normal ; as it leaves the prism, it bends ................. the normal.
When a beam of white light is passed through a prism, it splits to form lights of seven colours. Is it possible to recombine the lights of seven colours to obtain the white light again? Explain your answer.
What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?
Name the process which is involved in the formation of a rainbow.
A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is:
(a) violet
(b) red
(c) green
(d) blue
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
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.
The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
Answer the following:
What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.
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.
How can the presence of ultraviolet radiation be detected?
Write the range of wavelength of the visible spectrum.
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| The wavelength of red light | (a) 600 nm |
| (b) 700 nm | |
| (c) 500 nm |
Rainbow is a beautiful natural phenomenon. It is the combined effect of a natural three processes together produced by light. Write it into the circle.
Say TRUE or FALSE
After passing through a prism, white light splits into a band of seven colours
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
