science
Grade-7
Easy
Question
The incident ray is parallel to the emergent ray when the light ray ____.
- Crosses only one medium
- Crosses multiple mediums and finally reaches in the initial medium
- Only during normal incidence
- All of the above
Hint:
All of the above
The correct answer is: All of the above
The incident ray angle is equal to emergent ray angle in glass slab or any medium so they are always parallel.
In case of Normal Incidence also it is equal because i=e=0 degree
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