Refraction: light speeding up and slowing down, between mediums.
When light travels from a more dense material to a low density material like glass to air, light will be refracted away from the normal.
When light travels from a less dense material to high density material, for example from air to water, light will be refracted towards the normal.
Similarly, the refracted ray is a ray that shows the direction that light travels after it has crossed over the boundary. In the diagram, a normal line is drawn to the surface at the point of incidence. This line is always drawn perpendicular to the boundary. The angle that the incident ray makes with the normal line is referred to as the angle of incidence. Similarly, the angle that the refracted ray makes with the normal line is referred to as the angle of refraction. The angle of incidence and angle of refraction are denoted by the following symbols:
= angle of incidence
= angle of refraction
--- = Normal 90'
The bending of light as it passes into a transparent material of different optical intensity is known as refraction.
It is called refraction.
It happens because light is a wave and it travels at different speeds in the two media.
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