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In fog, photographs of the objects taken with infrared radiations are more clear than those obtained during visible light because

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Important Questions on Dispersion and Scattering of Light

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
The smoke from a fire looks white. Which of the following statements is true?
(1) Molecules of the smoke are bigger than the wavelength of light. 
(2) Molecules of the smoke are smaller than the wavelength of light.
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Why does sky appear blue?
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Define scattering.
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
The blue colour of sky is due to:
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Explain why thin clouds look white while clear sky looks blue.
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
The sky as seen from the surface of the moon appears dark because,
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
During sunset or sunrise the sun appears reddish because:
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is μ , a ray, incident at an angle θ , on the face AB would get transmitted through the face AC of the prism provided:

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Total internal reflection may be observed if
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
Explain why the bluish colour predominates in a clear sky.
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
What phenomenon of light causes the blue colour of the sky and the reddening of the sun at sunrise or sunset?
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light

Explain Raman scattering of light?

 

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light

You know the phenomenon of the scattering of light by atmospheric particles. Write a few lines about the blue colour of the sky and reddish colour of the sky in the morning as well as in the evening.

 

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
What would be the colour of the sky if the earth had no atmosphere?
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light

Why does sky appear blue?

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
A parallel beam of light is incident from air at an angle α on the side PQ of a right angled triangular prism of refractive index n=2 . Light undergoes total internal reflection in the prism at the face PR when α has a minimum value of 45o. The angle θ of the prism is:

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
The angle of incidence for a ray of light at a refracting surface of a prism is 45o. The angle of prism is 60o. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light

Stokes and anti stokes lines observed in Raman scattering is due to _______ of light.

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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
What do you understand by scattering of light?
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Physics>Optics>Dispersion and Scattering of Light>Scattering of Light
A setting sun appears to be at an altitude higher than it really is. This is because of