21.The place where the refracted rays from the convex lens meet on the principal axis is
A. optic centre of the lens
C. radius of curvature
B. Centre of curvature
D. principal focus
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21.The place where the refracted rays from the convex lens meet on the principal axis is
A. optic centre of the lens
C. radius of curvature
B. Centre of curvature
D. principal focus
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Answer:
D Principal focus As incident rays are parallel