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The process of Light Refraction bends light rays as they pass from one substance to another, depending on the densities of these substances. In the case of water, the light goes from air (lower density) to water (which is denser) so the light is refracted at a smaller angle (with the 'normal' being 0 degrees) than when it entered.
figure 1 shows the light going from low to high density, so the light refracts at a smaller angle.
figure 2 shows the light going from high to low density, so the light refracts at a larger angle
Picture is from [http://library.thinkquest.org/27066/lightrays/nlrefraction.html]
Basically, the light refraction makes objects in a pond seem closer than they actually are
Hope this helps :]
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∙ 14y ago
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