Question

Man A has a defect of vision due to which he cannot see the nearby objects clearly (though he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant object clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.
(a) Name the defect of vision in man (i) A, and (ii) B.
(b) What type of lenses are (i) C, and (ii) D?

Answer 1

Answer:

(a) A hypermetropia

B myopia

(b) C convex lens

D concave lens

Explanation:

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Answer 2

(a) The defect of vision in man (i) A is Hyperopia and (ii) B. is myopia.

(b) The type of lenses are (i) C is convex lens and (ii) D is concave lens.

Explanation:

• Eyes can proper have vision only when the image correctly falls on retina.
• In hyperopia, the falls behind retina which means the eyeball is too short or refractive power of eyes is weak.
• The convex lens diverges light and extends the light falling on eye and makes the image to fall on retina properly.
• In myopia, the image falls in front of retina which means the eyeball is too long or refractive power of eyes is strong.
• The concave lens converges light and reduces the distance light travels and make image to fall exactly on retina.