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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
Draw a ray diagram to show the dispersion of white light.
In the formation of spectrum of white light by a prism:
which colour is deviated least?
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.
What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?
What acts as tiny prisms in the formation of a rainbow?
When white light passes through a prism, it ............
Which is optically denser: water or air? Give reason
Define the term dispersion of light.
Explain the cause of dispersion of white light through a prism.
What conclusion do you draw about the nature of white light in part (b)?
What do you understand by the term spectrum?
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
Complete the ray diagram given below to show the nature of light produced on the screen.
The completed ray diagram is as shown below:
The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
What is dispersion? Explain in detail.
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
Curved mirrors have surfaces that are spherical, cylindrical, parabolic, and ellipsoid.
During dispersion of white light by prism placed in air, for a particular value of angle of prism,
State True or False:
"Wavelength of red light is close to 700 nm.”
