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Limit of Resolution

A doctor advi...

Question

A doctor advises a patient to use spectacles with a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. What is the power of the resultant combination:

A

-6.5 D

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B

-1.5 D

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C

6.5 D

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D

1.5 D

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Solution

The correct option is B -1.5 D
$P = P_{1} + P_{2} = \frac{1}{40 / 100} - \frac{1}{25 / 100} = 2.5 - 4 = - 1.5 D$

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