Question

15. Explain the following:

(a) A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.

(b) A straight stick partly dipped in water obliquely, appears to be bent at the surface of water.

(c) The sun is seen before the sunrise and after the sunset.​

Answer 1

Refraction of light.

Explanation:

All three phenomenon occur due to the refraction of light when going from denser to rarer medium or vice versa.

(a) Light when going from denser (water) medium to rarer (air) towards your eyes gets refracted and image of coin appears to be raised.

(b) Light when going from denser (water) medium to rarer (air) towards your eyes gets refracted and image of stick appears to be bent at the surface of water.

(c) Light when going from rarer (vacuum) medium to denser (air) towards your eyes gets refracted and image of sun appears to be stay for a short period of time even when sun isn't present above or dips below the visible line of sight.

Answer 2

Answer:

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