A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

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Chapter 10 NCERT Class 10 Science SOLUTIONS

4. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

Question:

A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

Answer:

The student is suffering from myopia. It can be corrected with a concave lens.

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(All Q's of this Chapter solved)

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Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

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The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

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A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting : (i) distant vision, and (ii) near vision?

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The change in focal length of an eye lens is caused by the action of the : (a) pupil (b) retina. (c) ciliary muscles. (d) iris.

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The least distance of distinct vision for a young adult with normal vision is about (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m

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The human eye forms the image of an object at its : (a) cornea (b) iris (c) pupil (d) retina

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The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to : (a) presbyopia (b) accommodation (c) near-sightedness (d) far-sightedness

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What is the far point and near point of the human eye with normal vision?

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A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?

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