Answer:
When light rays travel from one medium to another, their speed changes. Their speed changes due to the different densities of the two mediums.
During refraction the light rays bend toward or away from the normal depending upon the change in speed.
They bend toward the normal when the rays are travelling from a rarer to a denser.(The speed decreases)
They bend away from the normal when the rays are travelling from a denser to a rarer medium.(The speed increases.)
Hence, refraction occurs due to the change in the speed of the light rays.
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Answers & Comments
Answer:
When light rays travel from one medium to another, their speed changes. Their speed changes due to the different densities of the two mediums.
During refraction the light rays bend toward or away from the normal depending upon the change in speed.
They bend toward the normal when the rays are travelling from a rarer to a denser.(The speed decreases)
They bend away from the normal when the rays are travelling from a denser to a rarer medium.(The speed increases.)
Hence, refraction occurs due to the change in the speed of the light rays.