Which of the following statements is/are true? *
1 point
(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
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Answer:
The Power of convex lens is positive
p = 1/f
hence,focal length of convex lens is also positive
The required option a."A convex lens has 4 dipotre power having a focal length 0.25m" is correct.
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