science
Grade-7
Easy
Question
During normal incidence on multiple mediums placed one after the other, the ____ are equal.
- Angle of incidence and refraction at the first interface
- Angle of incidence and refraction at all the interfaces
- Angle of incidence and refraction at all the interfaces and the angle of emergence
- Only the angle of incidence and emergence
Hint:
- The angle of incidence is always equal to the angle of emergence in a glass slab (i=e).
The correct answer is: Angle of incidence and refraction at all the interfaces and the angle of emergence
- The angle of incidence is always equal to the angle of emergence in a glass slab (i=e) because incident ray and emergent ray are parallel.
- In normal incidence angle of incidence is equal to 0 because the incident ray is perpendicular to the the surface separating the two media, hence the normal and the incident ray are on the same line.
- And by snell's law angle of refraction =0
- During normal incidence on multiple mediums placed one after the other, the Angles of incidence and refraction at all the interfaces and the angles of emergence are equal.
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