1.

When a ray of light passes thorugh a glass slab how many times does it change its path and why ?

Answer»

Solution :The ray of light bends TWICE.
RIGHT TIME when it enters from air to the glass SLAB, it bends towards te normal, i.e., fromrarer medium to denser medium.
Second time, when the ray moves out fromthe glass slab to air, it bends away from the normal, i.e.,it moves from denser medium to RARER medium.


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