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Chapter 5: Q2DQ (page 1104)

Sunlight or starlight passing through the earth鈥檚 atmosphere is always ben toward the vertical. Why? Does this mean that a star is not really where it appears to be? Explain.

Short Answer

Expert verified

Yes, we see the sun or star through the refracted light.

Step by step solution

01

Definition of Refraction

Refraction is the redirection of a wave as it passes from one medium to another.

02

Determine the reason using Snell’s law

When light enters from a rarer medium to a denser medium it gets refracted towards the normal, according to Snell鈥檚 law. The earth鈥檚 atmosphere is having denser medium than the outside so the light will bend towards the normal.

As the light is getting refracted we are seeing the Sun or Star through the Refracted light. It means if on extending the refracted light, the apparent position of the Sun or Star is seen than the actual.

Thus, Sunlight or starlight passing through the earth鈥檚 atmosphere is always ben toward the vertical because of the Refraction.

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