16. When a concave mirror is held towards the sun and its sharp image is
formed on a piece of carbon paper for some time, a hole is burnt in the
carbon paper--What is the name given to the distance between mirror and
carbon paper?
(a) Radius of curvature
(b) Focal length
(c) Principal focus
(d) Principal axis
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option number is
(a) Radius of curvature
hope it helps
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