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An eye specialist prescribes spectacles having a 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 dioptres is

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+6.67

-6.67

-1.5

+1.5

answer is B.

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Detailed Solution

Power of convex lens $P_{1} = \frac{100}{40} = 2 .5 D$

Power of concave lens $P_{2} = - \frac{100}{25} = - 4 D$

$Now P = P_{1} + P_{2} = 2 .5 D - 4 D = - 1 .5 D$

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