Reflection and Refraction

When a ray of light strikes a surface like water, it does two things:

* Reflection: Some of the light bounces back off the surface. This is called reflection. The angle of incidence (the angle the light hits the surface) is equal to the angle of reflection.

* Refraction: Some of the light passes through the water. This is called refraction. The light bends as it enters the water because the speed of light changes when it moves from air to water.

The Angle of Refraction

The angle that the light entering the water makes with the normal (an imaginary line perpendicular to the surface) is called the angle of refraction.

* Snell's Law: The relationship between the angle of incidence, the angle of refraction, and the indices of refraction of the two mediums is described by Snell's Law. It states:

* n1 * sin(θ1) = n2 * sin(θ2)

* where:

* n1 is the index of refraction of the first medium (air)

* θ1 is the angle of incidence

* n2 is the index of refraction of the second medium (water)

* θ2 is the angle of refraction

Important Points:

* The angle of refraction is always smaller than the angle of incidence when light goes from a less dense medium (air) to a denser medium (water).

* The amount of bending depends on the difference in the indices of refraction between the two mediums. The greater the difference, the more the light bends.

Let me know if you would like a diagram or further explanation!