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

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Solution

Air to glass slab: In this case, the light ray travels from rarer to denser medium. As the speed of light is reduced on reaching the glass slab, the light ray bends towards the normal.

Glass to Air: In this case, the light ray travels from denser to rarer medium. As the speed of light is increased on reaching the air, the light ray bends away from the normal.

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Similar questions

A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it ?

When a ray of light from air enters a denser medium, it :

(a) bends away from the normal

(b) bends towards the normal

(d) is reflected back.

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