Straight - The direction light rays travel, Reflection - When light bounces off a flat shiny object, Refraction - When light bends on entering a new material, Boundary - The point at which light starts to bend , Angle of incidence - The angle between the ray entering a surface and the Normal, Angle of refraction - The angle between the ray in the new medium and the Normal, Normal - The virtual line from which all angles are measured , emergence - the angle between the ray exiting a medium and the normal, densities - light bend in different mediums due to their different ..., smaller - the angle of refraction is ... in glass than air, faster - light travels ... in air than in glass, Energy - all waves transfer this, Transverse - Light is an example of this type of wave, longitudinal - sound is an example of this type of wave , Frequency - Tje number of waves passing a point in one second, wavelength - the distance between two consecutive crests or troughs, Echo - a reflected sound wave, Ultrasound - Sound waves with a frequency over 20kHz, Visible light - The only section of the electromagnetic spectrum we can see,

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