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Let us consider an object 'O' at the bottom of a river/swimming pool. Light speeds up as it travels from water to air. So, the ray is bent away from the normal. As a result for an observer on the shore, it appears as if the rays are coming from a point 'I', which is just slightly above the bottom of the surface That is why rivers and Swimming Pools seem shallower than they really are.

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Q: Why do rivers appear shallower than they really are?
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Related questions

Why does a pond appear shallower than it really is?

Due to refraction. When light travels through a denser substance, it bends towards the normal, so things appear to be at a different angle, size or depth than they really are.


Does refraction tend to make objects submerged in water seem shallower or deeper than they really are?

Shallower.


If you fill up a sink with water does it appear deeper or shallower?

Due to the refraction of light, a body of water (whether its a sink, pool or lake) will appear more shallow than it actually is.


Why water in a rock pool often appears to be much shallower than it is?

Because the light is refracted and so the water appears shallower than it is Because the light is refracted and so the water appears shallower than it is


Are women shallower than men?

No.


Is the condition when objects appear larger than they really are?

Yes.


What do you do if none of your friends will talk to you because your boyfriend is ugly?

Get friends who aren't shallower than a puddle.


Is resolution the condition when objects appear larger than they really are?

Yes.


Are PFDs more buoyant in deep water than in shallower water?

yes


How a swimming pool looks shallower than it actually is?

It is an illusion that water causes.


A swimming pool appears shallower than it is because of?

This is because of the refraction of the light when it hits the water.


Do mountain rivers flow slower than lowland rivers?

No. In the mountains, gravity makes the rivers flow faster. Lowland rivers are slower than mountain rivers.