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light:light

Light

1. An object that does not allow any light to pass through will form a shadow. Shadows are formed by light because if light shines onto an object and the object blocks the light, the light will go sideways of the object, and therefore a shadow is formed. Light can only travel in straight lines.

2. An object that does not allow any light to pass through will form a shadow. Shadows are formed by light because if light shines onto an object and the object blocks the light, the light will go sideways of the object, and therefore a shadow is formed. Light can only travel in straight lines.

3. The normal is a dotted line 90 degrees from an object.

4. I can label the angle of incidence and the angle of reflection on a diagram.

5. When a ray of light hits a plane mirror, the light ray reflects off of the mirror. Reflections involves the light ray changing in its direction, this is why the ray is not reflected in the same direction. The incidence ray is the original ray of light and the reflective ray is the ray that has been reflected. There are equal angles between the two rays which are called the ‘angle of reflection’ and the ‘angle of incidence’

6.

  • Diffuse reflection is reflection from a rough surface.
  • In diffuse reflection, the light rays are sent in all directions.
  • Specular reflection is reflection from a smooth surface.
  • In specular reflection, the light ray reflects in a manner where the angle of incidence is equal to the angle of reflection.

7. Refraction is when a light ray hits a glass block at an angle and the ray changes its direction and speed. The ray travels to the other side and bends back to its original direction and leaves the block.

8. Light bends towards the normal when it travels from air into glass. When light travels from air into glass, it slows down and bends towards the normal.

9. The light speeds up going into substance that is less dense, and the ray bends away from the normal as it exits the glass (or other transparent substances) and enters into the air. This is an example of refraction.

10. When light travels, it can go through many different objects as long as they are transparent. But, it can travel faster in some objects than in others. Light travels faster in air than it does in glass or water.

11. The seven colours in order of the spectrum are red, orange, yellow, green, blue, indigo and violet.

12. A diagram can be used to show the path of a coloured ray of light through a prism.

13. When white light enters glass prism it splits into seven different colours. When sunlight shines through raindrops we see a rainbow. The scientific name for a rainbow is a spectrum. The seven colours that come out of the side of the prism are as follows: Red, Orange, Yellow, Green, Blue, Indigo and Violet.

14. White light can be split up to form a spectrum using a prism. This is called dispersion. The light waves are refracted as they enter and leave the prism. Red light is refracted the least and violet light is refracted the most, causing the coloured light to spread out to form a spectrum.

15. When a white light shines on a object, the object will absorb some of the colours from the spectrum and some will be reflected. For example when light is shined on a red book it will reflect as red and will absorb the other colours; Orange, Yellow, Green, Blue, Indigo and Violet.

16. If only blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would be no red light to be reflected.

17. E.g. a red filter absorbs every colour and only reflects red (let it pass through).

light/light.txt · Last modified: 2016/05/20 14:21 by rheadi