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Friday 19 May 2017
Light
Light is a form of energy. The speed of light is 3 × 108 ms-1 and it travels at a constant speed. It can reach the earth from the sun in 8 minutes.
Human eye can detect it in a range of 7 colours from red to violet which forms a spectrum.
Rectilinear Properties Of Light:
- It states that light travels in straight line.
- It can’t bend around corners and can only travel straight
- The path along which light travels is known as light ray. Arrows are added to indicate the direction.
Combination of rays forms a beam. There are three types of beams:
Parallel:
Converging:
Diverging:
Luminous Objects: These are those objects that give out light. E.g.TV, Sun, Light bulbs
Non-Luminous Objects: These are those objects that do not give out light.
We can see them as the object reflect light from a luminous object nearby into our eyes.
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