Good Evening
what do you mean by focus ?
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Answered by
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Explanation:
Focus - The point on the principal axis at which the incident rays which are parallel to the principal axis, meet after reflection from the mirror is called focus. Focal length - The distance between focus and pole is focal length.
Answered by
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The point where all the rays after converging from a convex lens meet , on the principal axis is called the focus.
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