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Ciliary muscles of human eye can contrac...

Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye ?

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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.

The ciliary muscles can change the focal length of the eye lens. Find the ratio of focal lengths of the eye lens when it is focused on two different objects, one at a distanace of 2 m and the other at a distanc of 1 m. The diameter of normal eye is 2.5 cm.

What is the function of the lens in the human eye ?

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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. Why does it take some time to see objects in a dim room when you enter...

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

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

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

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

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

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

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

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

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

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

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

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  13. The least distance of distinct vision for a young adult with normal vi...

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  14. Refraction of light in the eye occurs at :

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  15. To focus the image of a nearby object on the retina of an eye :

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  16. The term "accommodation" as applied to the eye, refers to its ability ...

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  17. Which of the following controls the amount of light entering the eye ?

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  18. The human eye possesses the power of accommodation. This is the power ...

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  19. How does the eye change in order to focus on near or distant objects ?

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  20. Which of the following changes occur when you walk out of bright sunsh...

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