a ray of light which strikes a glass slab from air at normal incidence passes through the slab
-
A.
undeviated and undisplaced at a lower speed -
B.
deviated and undisplaced at a lower speed -
C.
deviated and displaced at a lower speed -
D.
undeviated and displaced at a faster speed
Correct Answer: Option A
Explanation
The angle of refraction will be zero as the angle of incidence is zero in this case. This is a rule, that whenever a ray strikes perpendicularly or normally to a surface, no refraction will take place and hence the ray will pass through without deviating from its path.