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Light Facts

 
Light Facts

Where do Light Sources come from?

1.)  Electric light bulb

2.)  Candle Flame

3.) Sun and other stars

  • What is Light?

 

light prism image
 
  • Our main source of light on Earth comes from the Sun.

  • A ray of light travels very fast.   The speed of light in space is approximately 300 million metres per second.

  • Light is a kind of energy that can move in waves and it is made up of a flow of small particles of energy called photons.

  • A ray of light travels very fast.

  • Because light travels faster than sound you see lightning before you hear the thunder.

  • The speed of light equals 300,000 km/second.  Nothing else travels faster than light, not even sound! 

  • It takes just over 8 minutes for light to travel from the Sun to Earth a distance of 93 million miles.
  • The white light from the Sun is made up of the seven colors (spectrum) of the rainbow:

  • White light can be split to give a range of colors:  red, orange, yellow, green, blue, indigo and violet.
  • Dispersion by a prism shows that white light is a mixture of all the colors (spectrum).

  • If our Earth did not have an atmosphere, the sky would be black like outer space. We would be able to see stars in our daytime like an astronaut sees stars in space.

  • We cannot see colors in the dark.  What makes it possible for us to see colored objects is white light made up of all colors.

  • Light must enter our eyes so that we can see. Light can travel through space and through the air. It travels at high speed, much faster than the speed of sound.

  • Light travels from sources and falls onto surfaces. We see surfaces because they reflect or scatter the light.

  • When objects block the pathway of bright light, shadows are formed.

  • A mirror has a very smooth surface. When a mirror reflects a ray of light the angle of incidence is always equal to the angle of reflection. Rough surfaces do not normally produce clear images.

  • When light passes from one substance to another it can change direction. We say that refraction happens at the surface between the substances. We can draw the rays to help us think about refraction as well as reflection.

  • A prism can disperse white light into a spectrum of colors. This shows that white light is a mixture of colored light. Some surfaces only reflect some of the colors.

  • Some objects appear colored. They reflect certain colors of white light and absorb the other colors. The light reflected to the eye is the color you see.


  • What are the uses of Sun Light:

    1.)  For Energy
    2.)  For Warmth - Heat
    3.)  To see things - Light
    4.)  To help things grow

    *** Don't look directly into the Sun as it can damage your eyes***

 
 
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