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A beam of light traveling in air strikes a glass slab at an angle of incidence...

A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90°. After entering the glass slab, what does the beam of light do?
A) It follows the same path as before it struck the glass.
B) It follows the normal to the glass slab.
C) It bends away from the normal at the point of contact.
D) It bends closer to the normal at the point of contact.
E) It slows down.
Science   Physics   
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