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Light Reflection and Refraction
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01/12/2020 12:34 pm
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Which of the following statements is/are true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre having a focal 0.25 m
1 Answer
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01/12/2020 12:36 pm
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
Explanation:
Positive sign with power and focal length indicates that the given lens is convex.
Also f = 1/P = 1/4
= 0.25 m