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The use of light in medicine is an extension of light’s evolutionary role in biology. Color perception is mediated by the absorption of light by three types of cones (blue, green and red, with respective wavelengths of 400–450 nm, 500–570 nm and 610–750 nm).
For example, ultraviolet light sterilizes medical equipment by killing bacteria and viruses. Quantum Mechanics. The study of light's electromagnetic properties also intersects with quantum mechanics. This explores the behavior of particles at very small scales. Light can behave as a wave and particle, known as wave-particle duality.
- Waves of Light
- Colours of Light
- To Summarise
These different colours of light have different wavelengths and frequencies. Red light has the longest wavelength, and the lowest frequency of the visible spectrum. Violet has the shortest wavelength, and the highest frequency of the visible spectrum.
Mixing coloured materials, such as paint, is an example of subtractive colour mixing. Red paint appears red to us because when white light strikes it, the red pigments reflect the red wavelengths of light and absorball of the wavelengths. This reflected light is what is seen by our eyes. The same is true for all of the other colours. So what about ...
Light travels very fast - at the speed of light in fact!Light travels as waves.Light travels in straight lines.appears as heat. This property is the basis for the use IR light to heat tissues. Also the heat produced by laser beams is used to weld a detached retina to the back of eyeball and to coagulate small blood vessels in retina. 4- Some time when alight photon is absorbed, a lower energy light photon is emitted. This property is known as fluorescence.
Medical Physics Chapter 14 Light in Medicine - 4 - KHU, EI 468. m Photo50 µm spot coagulation of the retina (Fig. 14.18) Heating a blood vessel ⇒ blood coagulation ⇒ block the vessel MRD (minimal reactive dose): 2.4 mJ in 0.25 s for 50 µm spot Typical exposure: 10 ~ 50 times MRD (24 ~ 120 mJ in 0.25 s for 50 µm spot) Repair reti na tears ...
Sep 22, 2021 · Light, as an electromagnetic wave, possesses several fundamental properties, which include intensity, wavelength, phase and polarisation 1,2 (see Fig. 1a).While the former three are scalar ...
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Jan 10, 2017 · Light and optical techniques have made profound impacts on modern medicine, with numerous lasers and optical devices currently being used in clinical practice to assess health and treat disease.
