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Ray-Optics

# Ray-Optics - Ray Optics The Ray Model of light Light...

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Ray Optics

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The Ray Model of light Light travels in straight line is the basis of the ray model of light. We define light ray as a line in the direction along which light energy is flowing
Reflection Specular reflection – from a flat, smooth surface. The law of reflection states that 1. The incident ray and the reflected ray are in the same plane normal to the surface, and 2. The angle of reflection equals the angle of incidence: θ r = θ i Diffuse reflection – from a “rough” surface

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The Plane Mirror Consider P , a source of rays which reflect from a mirror. The reflected rays appear to emanate from P' , the same distance behind the mirror as P is in front of the mirror. That is, s' = s .
Refraction When a light ray is incident on a smooth boundary between two transparent materials Part of the light reflects Part of the light continues into the second medium with a change in direction – REFRACTION. Snell’s law states that if a ray refracts between medium 1 and medium 2, having indices of refraction n 1 an n 2 , the ray angles θ 1 and θ 2 in the two media are related by

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Index of Refraction
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Ray-Optics - Ray Optics The Ray Model of light Light...

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