V.K. Sally Solutions for Chapter: Human Eye and Colourful World, Exercise 2: EXERCISE - 2A

Draw diagrams to show correction made by a suitable lens for hypermetropic eye.

We cannot see an object clearly, if it is placed very close to the eye. Explain.

What is presbyopia? Write two causes of this defect.

A $14$-year old student is not able to see clearly the questions written on the blackboard placed at a distance of $5 \mathrm{m}$ from him. Name the defect of vision he is suffering from.
(Choose from: Hypermetropia / Myopia / Presbyopia)

A $14$-year old student is not able to see clearly the questions written on the blackboard placed at a distance of $5 \mathrm{m}$ from him. Name the type of lens used to correct this defect. (Convex lens / Concave lens)

Explain the following terms used in relation to defects in vision and correction provided by them:

Astigmatism.

Explain the following terms used in relation to defects in vision and correction provided by them:

Bifocal lenses.

Explain the following term used in relation to defects in vision and correction provided by them:

Far sightedness