• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Properties of light
 

Properties of light

on

  • 2,209 views

please study

please study

Statistics

Views

Total Views
2,209
Views on SlideShare
2,203
Embed Views
6

Actions

Likes
3
Downloads
84
Comments
0

1 Embed 6

http://ceb4069.1bestarinet.net 6

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Properties of light Properties of light Presentation Transcript

    • REFLECTION OF LIGHT
    • Light
    • Part 1 – Properties of Light
      • Light travels in straight lines:
      Laser
      • Light travels VERY FAST – around 300,000 kilometres per second.
      At this speed it can go around the world 7.5 times in one second.
      • Light travels much faster than sound. For example:
      • Thunder and lightning start at the same time, but we will see the lightning first.
      2) When a starting pistol is fired we see the smoke first and then hear the bang.
      • Luminous and non-luminous objects
      A luminous object is one that produces light. A non-luminous object is one that reflects light. Luminous objects Nonluminous objects
      • Shadows
      Shadows are places where light is “blocked”: Rays of light
    • Properties of Light summary
      • Light travels in straight lines
      • Light travels much faster than sound
      • We see things because they reflect light into our eyes
      • Shadows are formed when light is blocked by an object
    • How do we see objects?
      • We see things because they reflect light into our eyes:
      Homework
    • Reflection
    • Reflection of Light
      • is the phenomenon of wave motion, in which a wave is returned after impinging on a surface.
      • Types of
      • Reflection
    •  
    • Specular Reflection
      • Reflection off of smooth surfaces such as mirrors or a calm body of water.
    • Diffuse Reflection
      • Reflection off of rough surfaces such as clothing, paper, and the asphalt roadway.
      • Applications
      • One application pertains to the relative difficulty of night driving on a dry asphalt roadway compared to a wet asphalt roadway.
    •  
    • The Law of Reflection The incident ray, the reflected ray, and the normal to the surface all lie in the same plane, and the angle of reflection θ r equals the angle of incidence θ i.
    •  
      • The ray of light approaching the mirror is known as the incident ray (labeled I in the diagram). The ray of light which leaves the mirror is known as the reflected ray (labeled R in the diagram).
      • At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror; this line is known as a normal line (labeled N in the diagram).
      • The angle between the incident ray and the normal is known as the angle of incidence .
      • The angle between the reflected ray and the normal is known as the angle of reflection .
    • Reflection
      • Reflection from a mirror:
      Incident ray Normal Reflected ray Angle of incidence Angle of reflection Mirror
      • The Law of Reflection
      Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!
    •