In
glass slab, the refraction
the refraction occurs at
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Light falling perpendicularly on glass slab
There is no bending of ray of light on entering the glass slab or coming out of it. In this case angle of incidence and angle of refraction is zero. The same happens if the ray of light falls perpendicularly on the surface of water.
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A ray of light EF in air is incident on the glass surface AB at point O. As the ray EO enters from air (rarer medium) to glass (denser medium), the ray bends towards normal and follows the path OO' inside the glass slab. At point O', refraction takes place again.
Explanation:
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