Q7 of 234 Page 279

What kind of lens is used to correct (a) short-sightedness (b) long-sightedness?

(a) The kind of lens which is used to correct short-sightedness is concave lens.

(b) The kind of lens which is used to correct long-sightedness is convex lens.


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5

What is the other name for

(a) myopia


(b) hypermetropia?

 6

What is the scientific name of

(a) short-sightedness, and (b) long-sightedness?

 8

State whether the following statement is true or false : Short-sightedness can be cured by using a concave lens.

 9

Name the defect of vision in which the eye-lens loses its power of accommodation due to old age.