Explain the following :
A coin placed at the bottom of a vessel
appears to be raised when water is poured
in the vessel.
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2
Answer:
The ray of light starting from A (denser) medium bends away from the normal. Due to Refraction of light the coin appears at B at a lower depth. Hence in the same way the depth of water appear to be less deep
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5
Answer:
(a) The coin at a appears to be at B i. e. depth of coin observed is less than actual depth at A. The ray of light starting from A (denser) medium bends away from the normal. Due to Refraction of light, the coin appears at B at a lower depth. Hence, in the same way, the depth of water appear to be less deep.
(b) The phenomenon is due to REFRACTION OF LIGHT when light passing from denser (water) medium to (Air) rarer medium appears to come from Q’ Virtual image in spite of Q. Same is true for any other point of the stick inside water. Stick appears to be raised or bent.
EARLY SUNRISE and SUNSET: At sun Rise When the Sun is just below the horizon, the light from the Sun suffers refraction from RARE to DENSER medium (As the atmosphere is warmer than layers near the earth at that time) bends towards the normal at each refraction. Due to continuous bending of light rays, the Sun can be seen even when its actual position is just below the Horizon. As a result, the Sun is seen in advance, two minutes before it rises above the horizon in the morning. Similarly, in the evening Sun is seen delayed by 2 minutes longer above the horizon after the Sunset.
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