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Myopia

Which type of...

Question

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

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Solution

(a) Convex lens has positive power.

(b) Concave lens has negative power.

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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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