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Question
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
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Solution
- Principal focus: The principal focus of the diverging mirror is the point on the principal axis from which all incident rays appear to diverge from behind the mirror.
- Focal length: The distance between the pole and the principal focus of a spherical mirror is called the focal length.
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