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219.A myopic person has a power of -1.25 dioptre.
What is the focal length and nature of his lens ?
(a) 50 cm and convex lens
(b) 80 cm and convex lens
(c) 50 cm and concave lens
(d) 80 cm and concave lens
(CDS 2016]
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Answer:
Answer is (d)
Focal length will be 80 cm and the lens is a concave one.
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