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InterviewSolution
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Define the principal focus of a concave length |
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Answer» Ans.\xa0Principal focus of a concave mirror is the point on its principal axis, where light rays coming parallel to principal axis actually converge after reflection from mirror. Principal focus of Concave lens:\t‘The concave lens’ is the\xa0diverging lens.\tWhen the “parallel rays of light” passes through the concave lens where the\xa0‘refracted rays diverge’ so that they can appear to come from a single point called “the principal focus”. \tThere is some distance between\xa0“the principal focus” and “the centre of the lens”, which is called ‘the focal length’. |
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