If the radius of curvature of a lens is 30cm,
then What is its focal length?
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If the radius of curvature of a convex mirror is 30 cm, what would be its focal length? Answer: The point on the principal axis where all the rays parallel to it meet after reflection is called focus. Since, R = 30 cm and f=R/2 we have, f=+15 cm for a convex mirror.
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