An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of local length 25 cm. The power of this lens combination in dioptre is

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answer is -1.5.

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Detailed Solution

Power of the lens combination is

$\begin{array}{l} P = P_{1} + P_{2} = \frac{1}{f_{1} (in m)} + \frac{1}{f_{2} (in m)} \\ = \frac{1}{+ 0 .40 m} + \frac{1}{- 0 .25 m} \\ = - 1 .5 m^{- 1} x = - 1 .5 D, \end{array}$

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