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when light falls obliquely, there is a change in direction as it moves from one medium to another but when it falls perpendicular to the surface , there is no change in direction even when two mediums
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when light falls obliquely, there is a change in direction as it moves from one medium to another but when it falls perpendicular to the surface , there is no change in direction even when two mediums are involved JUSTIFY

User Yiran
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wait in comments....................

User Adwaenyth
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