Which of the following statements is true?
(a) A convex mirror has 5 dioptre power having a focal length 0.20 m
(b) A convex mirror has -5 dioptre power having a focal length 0.20 m
(c) A concave mirror has 5 dioptre power having a focal length 0.20 m
(d) A concave mirror has -5 dioptre power having a focal length 0.20 m
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Answer.
option b
Explanation:
The focal length of a convex mirror is positive and the power of the convex mirror is negative
The focal length of a concave mirror is negative and the power of the concave mirror is positive.
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