Converging and Diverging Lenses


Converging/Convex Lenses --> the parallel rays of light move together (converge) at the principal focus

Three Rules for Refraction in a Converging Lens:
1. incident ray parallel to the axis, passes through the principal focus on the other side
2. incident ray passing diagonally through the centre of the lens
3. incident ray passing through the principal focus and then parallel to the axis 

(NOTE: you only need to draw 2 of these rays as long as you can show/see where the image is formed!)

  • An object at 2F --> real, inverted, same size image and


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