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Showing 1 question in Physics for Class 8. Tap a card to reveal the answer.
PhysicsLighteasyState the two laws of reflection of light.
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What it is
Reflection is light bouncing off a surface following two fixed rules.
Answer
First law: the incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane. Second law: the angle of incidence is always equal to the angle of reflection (i = r).
angle i = angle r
- •Incident ray, reflected ray and normal lie in one plane
- •Angle of incidence = angle of reflection (i = r)
- •Angles are measured from the normal, not the surface
Why learn this
It's why mirrors, periscopes and even your reflection in still water work.
💡 Memory trick
Angle IN equals angle OUT (i = r), both measured from the normal.