science
Grade-7
Easy
Question
A ray of light crosses a glass slab. At the air-glass interface, the angle of incidence is equal to the ____ at the glass-air interface.
- Angle of refraction
- Angle of emergence
- Angle of incidence
- None of the above
Hint:
In glass slab the first law of reflection is not followed.
The correct answer is: Angle of refraction
The correct answer is b) angle of emergence. According to the first law of reflection the angle is always equal to angle of incidence. But only in glass slab the angle of incidence is equal to angle of emergence. i=e is only true for a glass slab. The ray of light gets refracted twice and there is a lateral shift making the angle of incidence and emergence equal.
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