A doctor has prescribed a corrective lens of power +1.5D. The prescribed lens is__?

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Converging

Diverging

Half converging

Half diverging

answer is A.

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Detailed Solution

The prescribed lens is converging.
Given,
Power of the lens,
P = +1.5 D,

P = \frac{1}{f}

Here, P is the power of lens and f is focal length.
Substituting the values,

+ 1.5 = \frac{1}{f}

⇒

f = \frac{1}{1.5}

⇒

f = 0.67 m

The focal length of the corrective lens is positive, and hence, the prescribed lens is positive. Only the converging lens will have a positive focal length.

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