What happens when light passes through a lenses and prism
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What happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.
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When light passes through a lens, it bends and changes its direction.
When light passes through a prism, a band of seven colours (spectrum) is formed.
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