define the principal focus of a concave mirror
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principal focus=the rays traveling parallel to the principal axis of a mirror after reflection pass through (converge at)a point F this point this known as principal focus of the concave mirror. lt is real point in front of a mirror.
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the rays traveling parallel to the principal axis of a mirror after reflection pass through (converge at)a point F this point this known as principal focus of the concave mirror. lt is real point in front of a mirror.
Explanation:
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