Refraction and Lenses
Published on Nov 22, 2015
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PRESENTATION OUTLINE
OPTICAL DENSITY
- The speed of light in a material is related to the material's optical density
- One measure of optical density is the material’s index of refraction.
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INDEX OF REFRACTION
- The index of refraction (n) is the ratio of the speed of light in a vacuum to the speed of light in the material.
- Speed of light in a vacuum/speed of light in material=c/v
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TOTAL INTERNAL REFLECTION
- If the angle of incidence is increased further, the light ray bounces off the boundary back into the original material.
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CRITICAL ANGLE OF INCIDENCE
- The angle of incidence where this phenomenon begins is called the critical angle of incidence
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FIBER OPTICS
- Fiber optics is an important and growing field of technology with diverse applications.
- Optical fibers work on the principle of total internal reflection.
- Fiber optics has many uses in endoscopy—the medical procedure in which the body’s interior is viewed directly by use of an endoscope inserted through a natural opening or small incision.
Photo by Philou.cn
