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Published byMervin Reynolds Modified over 8 years ago
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ENLARGEMENT FACTOR OF LIGHT
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Initially, to evaluate the enlargement factor of the shadow, we have used a laser source of light. Noticing that the ray can not reflect all the shadow, we try to expand the light using a bottle of water.
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Then… noticing the various imprecisions that we have made, we follow a more theoretical way, calculating the measures of alpha angle. AC² = AB² + BC² BC = AC * senα senα = BC/AC α = 1 / sen ( BC/AC )
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Basing on the measurements taken previously, the sides of the triangles are in a proportion: AB / AD = BC / DE = AC / AE
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Having a common angle, the triangles ABC and ADE are similar. For this reason, changing the position of the side BC (screen), the ratios remain constant.
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Having a common angle, the triangles ABC and ADE are similar. Having verified the similarity of the triangles, it is possible to find the enlargement factor of the projected.
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From the similarity of triangles, we can deduce that The light spreads following straight lines If the trajectory would be a curve, the similarities would not be observed.
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