Match the columns in the following table and explain them. Column 1 Column 2 Column 3 Farsightedness Nearby object can be seen clearly Bifocal lens Presbyopia Far away object can be seen clearly Concave lens Nearsightedness Problem of old age Convex lens

The farsightedness is also known as hypermetropia in which the nearby objects are not see clearly but the far away objects are seen clearly. This occurs due to increase in the focal length of the eye lens or the shortening of the eyeball. This defect of vision can be correct using a convex lens of suitable power. The nearsightedness is also known as myopia in which the far away objects are not see clearly but the nearby objects are seen clearly. This occurs due to decrease in the focal length of the eye lens or the elongation of the eyeball. This defect of vision can be correct using a concave lens of suitable power. Presbyopia is that defect of vision that occurs in the old age due to the weakening of the ciliary muscles. This can be correct using a bifocal lens of suitable power. Column 1 Column 2 Column 3 Farsightedness Far away object can be seen clearly Convex lens Presbyopia Problem of old age Bifocal lens Nearsightedness Nearby object can be seen clearly Concave lens

E M B I B E

Science and Technology Standard Ten Part - 1>Chapter 7 - Lenses>Can you tell?>Q 1

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10th Maharashtra Board

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How do we perceive different colours?

Important Questions on Lenses

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10th Maharashtra Board

IMPORTANT

Science and Technology Standard Ten Part - 1>Chapter 7 - Lenses>Exercise>Q 1

Match the columns in the following table and explain them.

Column $1$	Column $2$	Column $3$
Farsightedness	Nearby object can be seen clearly	Bifocal lens
Presbyopia	Far away object can be seen clearly	Concave lens
Nearsightedness	Problem of old age	Convex lens