Light energy
Upcoming SlideShare
Loading in...5
×
 

Light energy

on

  • 796 views

Teach your friends about basic facts of light!

Teach your friends about basic facts of light!

Statistics

Views

Total Views
796
Views on SlideShare
796
Embed Views
0

Actions

Likes
0
Downloads
4
Comments
0

0 Embeds 0

No embeds

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

Light energy Presentation Transcript

  • 1. Light Energy
  • 2. What is light Energy? Remember in the beginning of the year?1. light is not a matter. it enable us to seeQuestion 1: Name one thing that uses light to carry out work (Note things need energy to do work)Plants! (Photosynthesis!)
  • 3. Sources of light Are things that give out Nature sources: Can you name some?a) These object give out light naturally Artificial Sources: Suggest somea) These give out light by using man-made power source, ex. batteries
  • 4. How do we see things Eyes*Note: thisdrawing mightnot be accurate,light are usuallyreflected at thesame angle
  • 5. Characteristic of Light  Travels in straight lines (although Albert Einstein prove it wrong as it doesn’t travel in straight lines in some circumstances :P
  • 6. •Is a material that allow NOLIGHT to pass through•Like: (name some)•Is a material that allow SOMELIGHT to pass through•Like: (name some)•Is a material that allow ALLLIGHT to pass through•Like: (name some)
  • 7. BookA Shadow is form!
  • 8. How are shadow form Since light travels in straight line, and when light is partially or completely block by an:1. Opaque(completely)2. Translucent(partially)
  • 9. How to change size of ashadow To make it smaller and clearer:1. Place object closer to the screen2. Place screen closer3. Place light source further To make it bigger and bluer:1. Place object further from screen2. Place screen further3. Place light source closer
  • 10. How to change shape of the shadow Change the position of light source:Ex:
  • 11. How to change the length Change the position of the light sourceEx: 。