(i) Neeta needs a lens of power - 4.5D for correction of her vision.
(a) What kind of defect in vision is she suffering from ?
(b) What is the focal length and nature of corrective lens ?
(c) Explain with the help of a diagram how this defect can be corrected ?
(ii) State the functions of each of the following parts of human eye.
(a) Cornea (b) Pupil (c) Iris (d) Retina

Explanation

### Step-by-Step Solution

**(i) Neeta needs a lens of power -4.5D for correction of her vision.**

**(a) What kind of defect in vision is she suffering from?**

Neeta requires a lens with a negative power of -4.5 diopters. A negative power indicates that she is using a concave lens, which is typically used to correct myopia (nearsightedness). Therefore, Neeta is suffering from myopia.

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