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light reflection introductory part

Suman Jha
29/04/2020 0 0

Light- It is a form of energy which produces the sensation of sight.

Properties of light

  • It is an electromagnectic wave.
  • Light travels along a straight path that is rectilinear propogation of light.
  • Speed of light in vacuum is 3×108 m/s

 

A Ray of light Beam of light
A ray of light is apath followed by light energy in a transparent medium A group of parallel rays of light emitted by the source of light.

light rays

Three types of beam of light

REFLECTION OF LIGHT

The process of returning back or bouncing back the light to the same medium after striking a surface is called reflection of light.

 

laws of reflection

1. Incident angle (θi) is equal to the reflected angle (θr).

               θi=θr

2. Incident ray, Reflected ray and normal to the reflecting surface at the point of incidence lie in the same plane.

  • Reflection of silver is highest that is approximately 95%
  • reflection of coal is approx. 4%

TYPES OF REFLECTION

 

REGULAR REFLECTION DIFFUESD REFLECTION
when a parallel beam of light falls on a smooth and highly polished surface. when a parallel beam of light falls on a rough surface. 
the reflected beam is parallel  the reflected light is not parallel
reflected light is directed in a fixed direction reflected light spread over wide area 
e.g. search lights , polished shoes ,automobile headlights etc. e.g. light reflected by wooden table ,newspaper etc.

 

 

 

 

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