Why does a concave mirror have a real principal focus, while convex mirror have virtual pricipal focus?
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in concave lens the light Ray's converge and in convex it diverge
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Explanation:
The concave mirror has a real principal focus because in concave mirror, all the incident rays which are parallel to principal axis pass through the focus F after reflected by the concave mirror.
That makes the real principal focus whereas a center of concave lens is thinner, therefore, during the pass of parallel light rays through lens the refracted rays diverge to appear like coming from one point.
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