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Myopia and Its Correction

The eye is a ...

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The eye is a natural optical device by which humans can see the objects around them. It forms an inverted and real image on the retina, by the phenomenon of refraction of light through a natural convex lens. Sam is unable to read anything closer than 75 cm. His mother discussed the same with the doctor. The doctor explained this vision defect to her and told her how it is corrected.
A) The possible cause of this defect is ____________ .

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Q. Read the paragraph given below carefully. Underline the mistakes in it and then rewrite the paragraph correctly in your notebook.

Long sight or myopia is a defect in the eye that is more common in old age. People suffering from this defect can read a book clearly, but find it difficult to see a distant road sign. The image of the object, instead of forming in front of the retina, forms behind it. This defect can be corrected by using a convex or a diverging lens.

Q. The eye is a natural optical device by which humans can see the objects around them. It forms an inverted and real image on the retina, by the phenomenon of refraction of light through a natural convex lens. Sam is unable to read anything closer than 75 cm. His mother discussed the same with the doctor. The doctor explained this vision defect to her and told her how it is corrected.
B) The power prescribed by the doctor to see the newspaper clearly placed at 25 cm.

Q. Eye is a natural optical device by which human could see the objects around him. It forms an inverted and real image on retina, through the phenomenon of refraction of light through a natural convex lens. Sam is unable to read anything closer than 75 cm. Her mother takes him to a doctor.
A) What is the possible cause of this defect?

Q. Eye is a natural optical device by which human could see the objects around him. It forms an inverted and real image on retina, through the phenomenon of refraction of light through a natural convex lens. Sam is unable to read anything closer than 75 cm. Her mother takes him to a doctor.
B) What power would the doctor prescribe him to see the newspaper clearly placed at 25 cm?

Q. A man having defective eye is unable to see anything closer than

40 c m

. The person is suffering from _______ and the power of appropriate lens to correct his vision is _____

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