PHGY 210 Lecture Notes - Lecture 16: Aqueous Humour, Vitreous Body, Extraocular Muscles
31 Jan 2013
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Wavelength: the distance between successive peaks or troughs. Frequency: the number of waves per second. Amplitude: the difference between wave trough and peak. The energy content of electromagnetic radiation is proportional to its frequency [i. e. high frequency (short wavelengths) has the highest energy content]. Only a small part of the electromagnetic spectrum is detectable by our visual system. This visible light consists of wavelengths of 400-700 nm. (see fig. Hot colours (e. g. red or orange) have long wavelength light and less energy than cool colours (e. g. blue or violet). In a vacuum, a wave of electromagnetic radiation will travel in a straight line. Reflection: the bouncing of light rays off a surface. This depends on the angle at which it strikes the surface. A ray striking a mirror perpendicularly is reflected 180 back upon itself and a ray striking a mirror at 45 angle is reflected 90 . Absorption: the transfer of light energy to a particle or surface.
