Define Principal focus and radius of curvature of a concave mirror.
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Principal focus is that point on the principal axis at which, a beam of light which is incident parallel to the principal axis converges after reflection from the concave mirror. A concave lens of focal length 15 cm forms an image 10 cm from the lens.
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Principal focus is that point on the principal axis at which, a beam of light which is incident parallel to the principal axis converges after reflection from the concave mirror. A concave lens of focal length 15 cm forms an image 10 cm from the lens.
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