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The change is focal length of an eye-len...

The change is 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 correct Answer is:
C
NA
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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. What happens to the eye when you enter a darkened cinema hall from bri...

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

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

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

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  5. Refraction of light in the eye occurs at :

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

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

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

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

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

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

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  12. The size of the pupil of the eye is adjusted by :

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  13. What shape are your eye-lenses : (a) when you look at your hand ? ...

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  14. Suggest how your irises help to protect the retinas of your eyes from ...

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  15. (a) Which parts of the eye cause rays of light to converge on the reti...

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  16. An object is moved closer to an eye. What changes must take place in t...

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  17. Why does the eye-lens not have to do all the work of converging incomi...

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  18. Name one of the common defects of vision and the type of lens used to ...

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  19. Name the defect of vision in a person : (a) whose near point is more...

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  20. Which defect of vision can be rectified : (a) by using a concave len...

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