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Power of a Lens

Which type of...

Question

Which type of lens has (a) a positive power, and (b) a negative power ?

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Solution

The power of a lens is the measure of its ability to converge or diverge a parallel beam of light on refraction through it .Negative sign for Concave lens and Positive sign for Convex lens. The S.I.unit of power is dioptre (D).

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Q. In a Std. X class, out of

40

10

students use spectacles,

2

students have positive power and

8

students have negative power of lenses in their spectacles.
Answer the following questions :
(i) What does the negative power indicate?
(ii) What does the positive power indicate?
(iii) Generally which type of spectacles do most of the students use?
(iv) What defect of eyesight do most of the students suffer from?
(v) Give two possible reasons for the above defect.

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