Q1 of 12 Page 92

Match the columns in the following table and explain them.


(i) Farsightedness


● It is also known as Hypermetropia.


● In this defect of vision, the closer objects are blurred


● It occurs due to the flat cornea or due to the incorrect curvature of the eye lens.


(ii) Nearsightedness


● It is also known as Myopia


● In this defect vision of distant objects are blurred.


● It occurs due to due to defect in eye lense as the image is formed in front of the retina and not on it.


● It is most common types of an eye defect.


More from this chapter

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2

Draw a figure explaining various terms related to a lens.

 3

At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.

 4

Give scientific reasons:

a. Simple microscope is used for watch repairs.


b. One can sense colours only in bright light.


c. We cannot clearly see an object kept at a distance less than 25 cm from the eye.

 5

Explain the working of an astronomical telescope using refraction of light.