Question

Explain in brief the reason for each of the following :(a) Advanced sunrise(b) Delayed sunset(c) Twinkling of stars

Answer 1

A)advanced sunrise is because of continuous atmospheric refraction that happens because density of atmosphere is more near the earth surface. as the ray of light that enters atmosphere not close to land they are refracted and due to continuous refraction the sunlight reaches land even after 2 min of original sunset.
b)the same is the case of delayed sunset as advance sunrise.
c)stars appear to twinkle because of sudden change in atmospheric density near land that causes refraction of light of stars to sometime increase or some time decrease which causes the star light to some time shine or sometime appear to be dim. it is also the amount of light entering earth from stars is not continuous that is also the reasons for stars to twinkle.
hope it helps

Answer 2

a. Advanced sunrise occurs because of continuous atmospheric refraction

b. Delayed sunset occurs because also of continuous atmospheric refraction  

c. Stars twinkle as they are very far away and the light they emit takes years to visit the earth and when this light enters the atmosphere it gets impacted by the densities and atmosphere.

Explanation:  

• Atmospheric refraction can be defined as the phenomenon by which the light gets deviated along with other waves of electromagnetic energy from being existing in a straight line to that of a fluctuating line due to the impact of the environment.
• This occurs as the air density variation impacts the light and the resultant is occurrences of advanced sunrise and delayed sunset.

Learn more about Atmospheric refraction:

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