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Why does a ray of light bend towards the normal when it enters from air in a glass slab and it bends away from the normal when it emerges out in the air?

Posted by Palak Prajapati 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 3 months ago

If light enters any substance with a higher refractive index (such as from air into glass) it slows down. The light bends towards the normal line. If light travels enters into a substance with a lower refractive index (such as from water into air) it speeds up. The light bends away from the normal line. When light rays travel from air into glass or from air into water, it bends towards normal. This is because the speed of light rays decrease while travelling from air into glass or water. Case 2: When light rays travel from optically denser medium to rarer medium then they bend away from the normal.

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