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15. (a) Name the defects of vision when a person cannot see clearly:

(i) nearby objects
(ii) distant objects

(b) Ritu needs a lens of power [tex]\(-2D\)[/tex] for correction of her vision.

(i) What kind of defect in vision is she suffering from?
(ii) What are the possible causes of this defect?
(iii) What is the nature of the corrective lens?



Answer :

GinnyAnswer

Final answer:

This answer explains nearsightedness and farsightedness, their causes, and corrective measures in a clear and concise manner.


Explanation:

Nearsightedness (Myopia):

  • (i) Nearby objects: In myopia, the person can't see nearby objects clearly.
  • (ii) Distant objects: Distant objects appear blurry due to overconvergence of light before reaching the retina.

Farsightedness (Hyperopia):

  • (i) Defect: Ritu is farsighted needing a lens of power -2D.
  • (ii) Cause: Hyperopia results from insufficient convergence of light from close objects.
  • (iii) Corrective lens: Ritu requires a concave lens to diverge light rays appropriately on the retina for clear vision.

Learn more about vision correction here:

https://brainly.com/question/42517975