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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