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Reflection and Refraction - Coggle Diagram
Reflection and Refraction
Waves on a surface
When EM waves hit a surface they can either be reflected, transmitted or absorbed
Absorbed
Some of the waves energy is transferred onto the material. Usually resulting in a temp increase of the material.
Reflection
LAW OF REFLECTION- the angle of incidence= angle of reflection
Electromagnetic spectrum
Radio waves- longest wavelength
Microwaves
Infrared radiation
Radiation
Visible light
Ultra violet
Xrays
Gamma rays- shortest wavelength
Humans can only see visible light
Refraction
when light is transmitted through the boundary between different materials, the light is bent
If an incident ray enters glass at an angle, then it will be refracted, bending towards the normal
When light leaves the glass, light will bend away from the normal.
TAGAGA- towards, air, glass, away, glass, air
A material which light passes through is known as a medium.
Speed of light
Refraction occurs because the speed of light changes depending on the density of the medium it is traveling through.
Speed travels at around 300000000 m/s
The more dense the medium, the slower light travels
Refractive index
Refractive index is a measure of how much a substance slows down light
If the refractive index value is high, it means light travels more slowly in that medium
REFRACTIVE INDEX= speed of light/ speed of light in medium
