Grade 7, Science Olympiad (CBSE) - Reflection of light 

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Grade 7  |   Science  |   Reflection of light, Light, Olympiad, CBSE, ICSE, SOF, ITO

Reflection of light

When light rays strike the boundary of two media such as air and glass, this ray of light gets turned back into the same medium.

Incident ray- This is the ray of light that falls on the surface from the source of light.

Reflected ray- This is the ray of light that is reflected from the surface.

Normal- It is an imaginary line which is used to a perpendicular on reflecting surface to measure the angle of incidence and angle of reflection.

If all the turned light rays are not parallel to each other we would consider it irregular or diffused reflection whereas the reflection of light from the smooth surface like that of the mirror is called regular reflection.

It is due to the diffused reflection that we are unable to see an object. 

Laws of reflection

1. The angle of reflection 'r' is equal to the angle of incidence 'i' always.

2. The incident ray, reflected ray and the normal at the point of incidence all lie in the same plane.

Note- Angle of incidence is the angle made between the incident ray and the normal whereasthe  angle of reflection is the angle formed between the reflected ray and the normal.

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