Explain why a piece of coin dropped inside water appears to be shallower than is the actual depth
Answers
Answer:
Refraction of light at the surface of the water makes coin appear shallower than its actual depth when viewed from directly above.
The reason is that the rays of light reaching us from the object at the bottom of the water do not come straight to us. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface. This bending is known as refraction, and it occurs whenever light passes from one transparent medium into another of different density.Our eyes do not take refraction into account but judge the position of the object as if the light came in a straight line.
When light emerges from glass or water into the air it speeds up again. If it meets the glass-air boundary at any angle other than 0o it will refract away from the normal. This is true for small angles – something else happens when the angles get larger.
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Explanation:
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Light bends when it passes from one medium (water) into another medium of a different density (air). This bending of light, called refraction, causes the apparent position of the coin to change to a shallower position1 (see diagram). The light bends when it passes from water to air on top of the water.