science
Grade-7
Easy
Question
A light ray enters a set of mediums placed one after the other and emerges out. The incident ray is ____ to the emergent ray.
- Always perpendicular
- Multiple refraction sometimes perpendicular
- Always parallel
- Sometimes parallel
Hint:
The angle of incidence is always equal to the angle of emergence in a glass slab (i=e).
The correct answer is: Always parallel
The angle of incidence is always equal to the angle of emergence in a glass slab (i=e).- Hence it must be parallel then only (i= e)
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