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Does Perspex obey Snell's Law? If so, what is its refractive index? Snell's Law: sin i v? sin r v2 v1 is a constant known as the refractive index (?), using this we can rearrange the v2 equation to form: sin i = ?sin r This means that sin i is directly proportional to sin r and if we measure both of these we will be able to calculate the refractive index. It can then be seen that once the ray enters the prism, it does not continue in a straight line, rather it is abruptly deviated and then travels through the prism until it reaches the far face, where the ray again suddenly deviates as it moves back into the air. This emergent ray is seen to be parallel to the incident ray. The abrupt change in direction of the ray of light as it changes the medium in which it is travelling is called refraction. It arises...

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