8P2 Light

• When you place a prism through a beam of white light, the

  different wavelengths (and therefore colours) refract at

  different angles. Causing them to disperse
• The primary colours are red, green and blue
• The secondary colours are magenta, yellow and cyan
• Medium Is material which light passes through it
• Light travels slower in glass than air because glass is more denser than air
• An object that gives out light is

  described as luminous
• Objects that absorb, scatter or reflect light

  and do not allow any light to pass through Are opaque
• Objects that transmit light and you can see

  through them Are transparent
• Objects that transmit light but diffusing

  (scattering) the light as it passes through Are translucent

  It’s not completely clear what the object is
• Filters let certain colours of light

  pass through, but absorb all other

  colours.
• A magenta filter absorbs all colours expect from red and blue
• A cyan filter absorbs all colours expect for blue and green
• When light is refracted, it changes speed and direction
• A continuous range of colours, such as a rainbow, is called the colour spectrum
• Therefore, the light will be bend from its normal path (straight

  line) when passing through medium of different densities.
• The emergent ray is the ray that emerges from the medium after a refraction