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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