Question

Assertion- sun is visible to us about minutes before the actual sunrise and about minutes after the actual sunset.

Reason - light from the sun near the horizon travels through larger distance in the earth's atmosphere

a - Both assertion and reason are true and reason is the correct explanation.

b - Both assertion and reason are true and reason is not the correct explanation.

c - assertion is true and reason is false

d - assertion is false and reason is true

Answer 1

Answer:

b)  Both assertion and reason are true and the reason is not the correct explanation.

Explanation:

• Assertion- We are able to see the sunrise 2 min before the actual sunrise and the sunset 2 minutes after the actual sunset due to the phenomenon called atmospheric refraction.

What is Atmospheric Refraction?

Ans) The Refraction of light by the Earth's atmosphere is known as atmospheric refraction.

• Reason- Light from the sun near the horizon travels through a larger distance in the earth's atmosphere. The reddish appearance of the sun at sunrise or sunset is due to the scattering of light by the molecules of air and other fine particles present in the atmosphere. Light from the sun passes through thicker layers of air and larger distances in the earth's atmosphere before reaching our eyes. Most of the blue light rays and other shorter wavelengths rays are scattered away by the particles in the atmosphere. Therefore, only red light, being of a higher wavelength reaches us which gives the reddish appearance of the sun at sunrise or sunset.

The Assertion is due to the phenomenon of atmospheric refraction and the reason causes the phenomenon of scattering. The reason does not explain the assertion.

Therefore, Both assertion and reason are true and the reason is not the correct explanation.

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