Refraction is the bending of light when it passes from one medium to another with different optical densities. It is why objects underwater appear clo
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Why do objects underwater appear closer than they actually are?
Light from underwater objects refracts at the water surface, bending away from the normal as it exits the water. This makes the objects appear at a shallower position than they actually are. Our brain interprets the refracted rays as if they came from a closer, shallower position.
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How do fiber optic cables use total internal reflection?
Light signals are sent down fiber optic cables at angles greater than the critical angle. The light bounces off the cable walls through total internal reflection, keeping the signal inside the fiber even as it travels long distances around bends.
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What is the refractive index and why does it matter?
The refractive index measures how much a medium slows light compared to vacuum. A higher refractive index means light is slowed more, causing greater bending when light enters or exits the medium. This is why different materials bend light by different amounts.
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