Hannah Walsh
Mind Map by Hannah Walsh, updated more than 1 year ago
Hannah Walsh
Created by Hannah Walsh over 6 years ago


A quick revision of the Light chapter in Exploring Science.

Resource summary

  1. Light:Light is a form of energy.
    1. In Photosynthesis light energy is changed to chemical energy in growing plants.The vegetables we get from photosynthesis we use to change into other forms of energy.
      1. Solar cells covert light energy to electrical energy. Solar cells can power satellites, calculators and parking meters in cities and towns.
        1. Light is used to turn electrical systems on and off.Heating systems are turned on during the day when needed and turned off again in the evening when it gets dark.
        2. Light is one of the forms of energy we get from the sun. Light energy is coverted to other forms:
          1. To show light is a form of energy you must show that light can move something. (Crookes Radiometer can be used to show this).
          2. Light travels at 300000000 meters in one second!
            1. Light travels in straight line.We can prove this by using a bulb and three pieces if cardboard.You take the cardboard and cut a hole in the exact same place in the middle of the peieces, then you move the three pieces of cardboard in a straight line with the light bulb, you will see that a strip of light shines through all the peices,however if you move one of the pieces of cardboard you will find that the light is cut off.This proves that light travels is straight lines.
              1. Shadows:Shadows are formed when light coming from a source is blocked.The shadow is then similar in outline to the object blocking the light.
                1. Example: Place your fingers between a candle and a screen and notice that as you bring yourfinger closer to the candle more light gets blocked out and the shadow gets bigger
                2. Reflection:Is the boucing of light from a surface. Example: Mirrors, Perriscope
                  1. We can see objects because some of the light which leaves the objects hits our eyes.
                    1. Luminous Objects: Are a source of light.
                      1. Examples: The Sun, A light bulb, a candle.
                      2. Non-luminous objects: Are seen as a result of light reflected from them.
                        1. Examples: Everything else (not emitting their own light)
                        2. A way of showing Reflection is using a ray box and a mirror, Shine the ray box on the mirror and see that the ray of light bounces off the mirror and reflects back in the same direction.
                      3. Refraction:Is the bending of light as it passes from one medium to another.
                        1. A way to demonstrate refraction is to shine a ray of light into a glass block and notice that it bends on the way in and also on the way out.
                          1. A lens is a curved pice of glass used to bend (refract) light inwards or outwards.
                            1. Refreaction of light through a Lens
                              1. Converging Lens (Convex Lens): Bends light so it converges to a point.
                                1. Diverging Lens (Concave Lens): Bends the light so that it diverges outwards.
                              2. Applications of Refraction: -Lenses -Specticales -Microscope -Telescope
                              3. Dispersion: Is the breaking up of white light into its individual colours (called a spectrum)
                                1. White light is made up of different colours which can be separated by dispersion.
                                  1. To produce a spectrum of white light use a bulb, a prism and a screen. Turn the prism slowly until a spectrum is formed on the screen.
                                  2. The colours of the spectrum are:
                                    1. Red
                                      1. Orange
                                        1. Yellow
                                          1. Green
                                            1. Blue
                                              1. Indigo
                                                1. Violet
                                                  1. Richard Of York Gave Battle In Vain
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