Lens and Images

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  • Created by: Simana
  • Created on: 29-10-15 12:43

Different Lenses 

Lenses form images by refracting light and changing its direction.

Converging Lens

(http://www.bbc.co.uk/staticarchive/b1a2d5cb46fd8a5a8dbcb9961ae6e8b2d5b524ba.gif)

  • A converging lens is a convex-it bulges outwards.
  • causes parallel rays of light to converge (move together) at the principal focus.
  • The principal focus of a converging lens is where rays hitting the lens parallel to the axis all meet

Diverging Lens

 (http://www.passmyexams.co.uk/GCSE/physics/images/concave.jpg)

  • A diverging lens is a concave-it caves inwards
  • Causes parallel rays of light to diverge.
  • The principle focus is the point where rays hitiing the lens parallel to the axis appear to all come from-you can trace them back until they all appear to meet up at a point behind the lens.

Rules for Refraction

Converging lens

  • An incident ray parallel to the axis refracts through the lens and passes

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