Question

in std x class out of 40 student, 10 student use spectacles 2 students have positive power and 8 students have negative power of lenses in their spectacles.
1 what does the negative power indicates
2 what does the positive power indicates
3what defect of eyesight do most of the student suffers from

Answer 1

1.Negative power indicates the eye sight is very high.
2.Positive power indicates eye sight is low.

3.Most of the students suffering from MYOPIA

Answer 2

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....