science
Grade-7
Easy
Question
Angle of incidence = ____
- Angle of refraction
- Angle of emergence
- Angle of incidence
- None of the above
Hint:
Recall the first law of reflection.
The correct answer is: Angle of emergence
The correct answer is d)none of the above.
According to the first law of reflection, when a ray of light is reflected from a surface the angle of incidence and angle of reflection is equal. A normal to the surface is drawn from where both the angles are measured.
Option a) is incorrect as angle of refraction is incorrect as it is greater than angle of incidence.
Option b) is incorrect as angle of emergence and incidence are only equal in a glass slab.
Option c) is incorrect as there is only one incident ray and therefore one angle of incidence.
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