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What is the function of lens in human eye?

Important Questions on Light

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Science>Physics>Light>Inside our Eyes
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
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Science>Physics>Light>Inside our Eyes
What is myopia? How it is corrected?
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Science>Physics>Light>Inside our Eyes
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? Why do we have two eyes for vision and not just one?
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Science>Physics>Light>Inside our Eyes
Shyam a student has difficulty reading the blackboard while setting in the last row. What could be the defect the child is suffering from? How can it be corrected? Explain with help of appropriate diagram.
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Science>Physics>Light>Inside our Eyes
Write the function of cornea of human eye.
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Science>Physics>Light>Inside our Eyes

A student sitting on the last bench of a regular classroom is able to see the written work on a blackboard but unable to read from his textbook. Identify the type of defect of vision he is suffering from. What kind of lens should he wear to correct the defect?

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Science>Physics>Light>Inside our Eyes
What are the defects of vision? A person needs a lens of power, -5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power, +1.5 D. What is the focal length of the lens required for correcting distant vision?
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Science>Physics>Light>Inside our Eyes
The change that occurs in the eye to see the distant objects clearly is
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Science>Physics>Light>Inside our Eyes
A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
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Science>Physics>Light>Inside our Eyes
Write the function of ciliary muscles of human eye.
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Science>Physics>Light>Inside our Eyes

In the given diagram which defect of the human eye is being corrected using a concave lens?

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Science>Physics>Light>Inside our Eyes

Consider the following vision defects listed in Columns I and II and the corrective measures in Column III. Choose the correct combination.

   Column I    Column II    Column III
 P.  Hypermetropia  (i)  Near-sightedness  a.  Convex lens
 Q.  Myopia  (ii)  Far-sightedness  b.  Concave lens
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Science>Physics>Light>Inside our Eyes

Which defect of the eye is shown in the figure given below?

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Science>Physics>Light>Inside our Eyes
Draw the ray diagram to show how hypermetropia is corrected.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 0.25 m.
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Science>Physics>Light>Inside our Eyes

Observe the given figure. Name the eye defect indicated in the figure and also mention the lens used to correct this defect.

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Science>Physics>Light>Inside our Eyes
The least distance of distinct vision for a normal eye is
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Science>Physics>Light>Inside our Eyes
The reciprocal of focal length of the lens is called power of lens. The power of lens can be measured in dioptre. The focal length of eye lens of eye of Jaishri is 25 cm. What is the power of eye lens of eye of Jaishri? Which type of lens's spectacles should she wear?
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Science>Physics>Light>Inside our Eyes
When do we consider a person to be myopic or hypermetropic? List two causes of hypermetropia. Explain using ray diagrams how the defect associated with hypermetropic eye can be corrected.
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Science>Physics>Light>Inside our Eyes
Write the function of iris of human eye.
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Science>Physics>Light>Inside our Eyes
The change in focal length of an eye-lens is caused by the action of the_____.