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How do you describe the ray pattern of light? What is the value of the speed...

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Physics

How do you describe the ray pattern of light?What is the value of the speed of light in a vacuum and in any medium?How is the law of reflection expressed for a wave?How is the refractive index of a medium defined?How is Snell's law for light expressed and what is the mathematical expression?

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A light ray is a line straight or curved that is perpendicular to the lights wavefronts its tangent is collinear with the wave vector The speed of the light in a vacuum is c3x108msThe    See Answer
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