Please answer this q.

Q. Does the incident and emergent ray coincide in a glass slab refraction? Give reason.

Q. A ray of light enters a diamond from air. If the refractive index of diamond is 2.42, what % (Per cent ) is speed of light in diamond with that of speed in air?
 
 

Dear Student ,

(1) No ,they don't because in a glass slab incident and emergent rey are parallel to each other.
Kindly post different query in separate threads 

Regards

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