science
Grade-7
Easy
Question
The angle between the incident ray and the emergent ray for refraction through a glass slab is ___ degrees.
Hint:
- The incident ray and emergent ray are parallel to each other.
The correct answer is: 0
- If 'i' is the angle of incidence and x is the refracted angle then at the second surface also x will be the angle of incidence by alternate angle property.
- Hence, angle 'i' will be the emergent angle which is equal to the incidence angle. So these two rays will be parallel. Hence, angle between incident ray and emergent ray = 0°.
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