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 the mirror and carbon paper?
(a) Radius of curvature
(b) Focal length
(c) Principal focus
(d) Principal axis
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Answer:
Focal length
Explanation:
When a spherical 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. When a spherical 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.
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Your question's answer is (b) Focal length.
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