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Light and Images
Part 2: Information
There are 2 main types of lenses :
How to draw ray diagrams
We represent the object by an arrow () and 2 construction rays are drawn from the top of the object.
The position and size of an image produced by a convex lens, can be found by scale drawing using graph paper; or by using the lens formula.
When f is measured in metres, represents the power of the lens in dioptres.