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CBSE Class 10 Answered

can you please draw the diagram of delayed sunset?
Asked by murugesan.s NA | 18 Jun, 2019, 08:33: PM
Expert Answer
The refraction of light through the atmosphere is responsible for many interesting phenomena.
For example, the sun is visible a little before the actual sunrise and until a little after the actual sunset
due to refraction of light through the atmosphere (see Figure).
 
By actual sunrise we mean the actual crossing of the horizon by the sun. Figure shows the actual and
apparent positions of the sun with respect to the horizon. The figure is highly exaggerated to show the effect.
 
The refractive index of air with respect to vacuum is 1.00029. Due to this, the apparent shift in the direction of the sun
is by about half a degree and the corresponding time difference between actual sunset and apparent
sunset is about 2 minutes .
Answered by Thiyagarajan K | 18 Jun, 2019, 10:42: PM

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