science
Grade-7
Easy
Question
During normal incidence of a light ray on a set of multiple mediums placed one after the other, the incident ray is not ___ the emergent ray.
- In the same line with
- Perpendicular
- Parallel
- All of the above
Hint:
- The angle of incidence is always equal to the angle of emergence in a glass slab (i=e).,and here it is normal incidence.
The correct answer is: Perpendicular
- The angle of incidence is always equal to the angle of emergence in a glass slab (i=e).
- In Normal incidence, the ray of light is perpendicular to the line of separation, so it lies in the same line as the normal, hence the incident angle is zero.
- So angle i=e=0
- Hence they are not perpendicular.
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