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Why is normal eye not able to see clearl...

Why is normal eye not able to see clearly the objects placed closer than 25 cm ?

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With the help of ciliary muscles the human eye can change its curvature and thus alter the focal length of its lens. State the changes that occur in the curvature and focal length of the eye lens while viewing (a) a distance object, (b) nearby objects. Explain, why a normal eye is not able to see distincly the objects placed closer than 25 cm, without putting any strain on the eye.

A normal eye is not able to see objects closer than 25 cm because

A person cannot see the objects distinctly, when placed at a distance less than 100 cm . What is the power of the spectacles that he should use to see clearly the objects placed at 25 cm ?

A person cannot see the objects distinctly, when placed at a distance less than 100 cm . What is the power of the spectacles that he should use to see clearly, the objects placed at 25 cm ?

LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. Give the scientific names of the following parts of the eye : (a) ca...

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  2. Fill in the following blanks with suitable words : (a) Most of the r...

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  3. Why is normal eye not able to see clearly the objects placed closer th...

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  4. What changes take place in the shape of eye-lens : (a) when the eye ...

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  5. The eye of a person are focused (i) on a nearby object, and (ii) on a ...

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  6. What change is made in the eye to enable it to focus on objects situat...

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  7. How is the amount of light entering the eye controlled ?

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  8. What happens to the eye when you enter a darkened cinema hall from bri...

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  9. Why does it take some time to see objects in a dim room when you enter...

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  10. A person walking in a dark corridor enters into a brightly lit room : ...

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  11. Ciliary muscles of human eye can contract or relax. How does it help i...

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  12. Describe and explain, how a normal eye can see objects lying at variou...

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  13. There are two types of light-sensitive cells in the human eye : (a) ...

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  14. What are rods and cones in the retina of an eye ? Why is our night vis...

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  15. (a) How does the convex eye-lens differ from the ordinary convex lens ...

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  16. (a) What happens to the size of pupil of our eye (i) in dim light (ii)...

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  17. (a) Draw a simple diagram of the human eye and lebel clearly the corne...

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  18. What happens to the eye when you enter a darkened cinema hall from bri...

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  19. The human eye forms the image of an object at its

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  20. The change is focal length of an eye-lens is caused by the action of t...

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