Why does a ray of light bend when it travels from one medium into another?

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Solution

When a light ray travels from one medium to another, then due to change in the density of the medium, speed of light changes. Change in the speed of the light at the boundary of two media force the light ray to bend from its original path.

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Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.

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