Light

Light

1. Light carries energy and travels in a wave

2. Speed of light - 300,000 km/s = 300,000,000 m/s

3. White Light

   • Red
   • Orange
   • Yellow
   • Green
   • Blue
   • Indigo
   • Violet

4. Luminous and Non-Luminous

   • A luminous objects is one that is a source of light.  A non-luminous object is one that reflects light from another source.

5. Colour

   • How do we see colours?  a coloured object will absorb all the colours of the spectrum apart from its own, and reflects that colour.  So a green ball will reflect the green light and absorb all the rest of the colours.  Black however, absorbs all the colours of the spectrum, so where you see a black object you are actually seeing an absence of light.
   • Primary Colours Red, Yellow, Blue

6. Refraction

   • Refraction is when light is bent.  when rays of light enter something more dense than air, they slow down and refract towards the normal line.  this is why a pencil in water looks bent.