Question #e59b8
3 Answers
due to refraction of light
Explanation:
when we see the stone from glass side it seems to be raised.this is due to refraction of light.since light travelling from glass (water) to air suffers deflection in path of light.
Detail explanation is below.
Explanation:
Assume an object is at point
The distance to the object, as we estimate it, depends on the angle
The eye muscles are not tense when we look straight forward at an object extremely far away, like a horizon, and the angle
Consider now an object is in the water. The light reflected by this object changes its direction when crosses the water/air boundary at some angle. If an angle of a ray of light with a perpendicular to this boundary is
Considering this, rays of light directed along straight lines between an object at point
But our brain senses only the position of eyes to estimate the distance. Greater tension of muscles is interpreted as closer distance. That's why we think that the object under water is closer than it really is.
Here is a diagram I drew of this:
The stone emits light in some direction, and our eyes send and collect light rays from some direction. When we look into a tub of water, our eyesight path is tricked into believing the stone is higher than it actually is because the index of refraction of water is higher than that of air or a vacuum (
This higher index of refraction bends the path of a light ray more towards the normal (perpendicular/normal to the surface of the water), and if our eyes knew that ahead of time, they would know where the stone was. However, we perceive our eyesight path to keep going straight without bending as we look through a denser medium, and we believe the stone is higher than it actually is.