Question

Which phenomenon causes an object to appear bent from above the surface of one medium to below the surface of another medium?

Answer 1

Refraction of light.

Step-by-step explanation:

The phenomenon that causes an object to appear bent from above the surface of one medium to below the surface of another medium is called the refraction of light.

There are two laws for the refraction :

• The ratio of sine of angle of incidence to the sine of angle of refraction is constant i.e.
• 
  `(sin\ i)/(sin\ r)=constant`
• The incident ray, the refracted ray, the normal all lie in the same plane.

Answer 2

the phenomenon that causes by an object to appear bent from above the surface of one medium to below the surface of another medium is : Refraction

For example, try to dip a pencil in a glass of water.
You will observe that the pencil will give out an impression as if it's been bent, but it's actually just an illusion caused by the light refraction.