Frequency, The number of vibrations in a unit of time., Wavelength, The distance between repeating points on a wave., Amplitude, The Height of the wave., Spectrum, All wavelengths of light in a sequence from shorter to longer wavelengths., Reflect, To bounce back., Refract, The bending of light when it moves from one substance to another., Echo, A sound that is reflected back to its source., Retina, The back of the eye where light is sensed., Lens, A shaped piece of glass or other material that can bend or refract light., Optic Nerve, Carries impulse from the retina to the brain.

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