Question

(4
Std. X class, out of 40 students, 10 students use spectacles, 2 stude
have positive power and 8 students have negative power of lenses in their
spectacles.
Answer the following questions :
(a) What does the negative power indicate?
(b) What does the positive power indicate?
(c) What defect of eyesight do most of the students suffer from?
​

Answer 1

1. Negative power indicates its focal length is negative and so, it is a concave lens..they have myopia

2. Positive power indicates its focal length is positive and so, it is a convex lens..they have hypermetropia

3. myopia....

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