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What do the ciliary muscles do when you ...

What do the ciliary muscles do when you are focusing on a nearby object ?

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The correct Answer is:
Make the eye-lens thicker (more converging)
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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.

LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. Where does the greatest degree of refraction of light occur in the eye...

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  2. What changes the shape of lens in the eye ?

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  3. What do the ciliary muscles do when you are focusing on a nearby objec...

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  4. What is the least distance of distinct vision for a normal human eye ?

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  5. What is the : (a) far point of a normal human eye ? (b) near point...

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  6. What is the range of vision of a normal human eye ?

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  7. Name the part of our eyes which helps us to focus near and distant obj...

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  8. Define the term "power of accommodation" of human eye.

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  9. Give the scientific names of the following parts of the eye : (a) ca...

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

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

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

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

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

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

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

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

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

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

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

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