Question

Noopur needs a lens of power -4.5 to 4 concentration of her vision.
1. what kind of Defect in this vision she is suffering from ?
2. What is the focal length and the nature and corrective lens.
3. draw ray diagram showing the(i) defected eye and (ii) correction for this defect.
4. What are the causes of this defect?

Answer 1

1) she is suffering from myopia .
2) -22.2 cm
4) a) because of its short focal length .
     b) due to eye ball being too long .

Answer 2

she is suffering from myopia.
causes of this effect is due to increasing in size of eye ball.
due to low converging power.