Reflection of Light Science Notes
→ Reflection of light: When light rays fall on an object, their direction changes and they turn back. This is called the reflection of light.
Laws of reflection of light
→ The angle of reflection is equal to the angle of incidence.
→ The incident ray, the reflected ray and the normal lie in the same plane.
→ The incident ray and the reflected ray are on the opposite sides of the normal. [Note: Here, a ray means a ray of light.]
Regular reflection of light
→ The reflection of light from a plane and smooth surface is called regular reflection of light. Here, for all parallel rays falling on the surface, i1 = i2 = i3 = … r1 = r2 = r3 = …, where i is the angle of incidence and r is the angle of reflection.
Irregular reflection of light
→ The reflection of light from a rough surface is called irregular reflection of light. Here, for parallel rays of light falling on the surface, i1 ≠ i2 ≠ i3, … and i1 = r1 ≠ r2 ≠ r3
→ The working of a kaleidoscope and periscope is based on the reflection of reflected light.