if a lense is placed in water why does it increase its focal length
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its because when it is placed in water the object seems to be biggger than they normally apper
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Lenses work by REFRACTION, not reflection, and the angle of refraction is based on the
difference between the speed of light in the lens compared to the surrounding medium. When
immersed in water, the difference between light's speed in the lens and the surrounding medium
is less than the difference when it's in air, and the focal length of a lens would be greater under water.
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