An eye specialist prescribes spectacles having combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is (a) + 1.5 (b) - 1.5 (c) + 6.67 (d) – 6.67.
An eye specialist prescribes spectacles having combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is (a) + 1.5 (b) - 1.5 (c) + 6.67 (d) – 6.67.
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Transcribed Image Text:An eye specialist prescribes spectacles having combination of
convex lens of focal length 40 cm in contact with a concave
lens of focal length 25 cm. The power of this lens
combination in diopters is
(a) + 1.5
(b) - 1.5
(c) + 6.67
(d) – 6.67.
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