The light from the sun is converged at a point in front of a concave mirror and appears as a sharp, bright spot. This point of the mirror is - (a) Centre of Curvature) (b) Principal focus (c) Pole (d) Aperture
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Answer:
(b) Principal focus
Explanation:
it is the definition of principal focus --
point where light rays from infinity (or very far) converge (meet) after passing through a convex lens is the principal focus
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