Scale diagrams for converging lenses
Lesson 15 / 27
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I can describe uses of converging lenses and draw scale ray diagrams to determine the position of an image.
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In cameras and the human eye, the required image distance < the object distance. The image is diminished and inverted.
In projectors, the required image distance > the object distance. The image is magnified and inverted.
A ray incident on a converging lens parallel to the principal axis is refracted to pass through principal focus.
A ray incident on the centre of a converging lens is not refracted.
A ray incident on a converging lens from the principal focus is refracted so it becomes parallel to the principal axis.
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