angle of incidence - Angle between the normal and the incident ray., dispersion - Spreading out of the different wavelengths of light, caused by refraction of light as it passes through a prism., frequency - The number of waves produced each second. The unit is hertz (Hz)., incident ray - Light ray moving towards a surface or boundary., normal - Acting at an angle of 90° to a surface or boundary., reflected ray - Light ray leaving a surface or boundary., spectrum - A series of similar waves arranged in order of wavelength or frequency., transparent - Able to be seen through., translucent - Allows light to pass through but is not completely clear., vacuum - A volume that contains no matter., lens - A transparent tool that can change the direction of a ray of light.,

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