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Where is the image formed in the eye of ...

Where is the image formed in the eye of a person suffering from near-sightedness?

A

On the retina

B

Behind the retina

C

In front of the retina

D

On the pupil

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The correct Answer is:
C
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Assertion:Image formed by concave lens is not always virtual. Reason:Image formed by a lens is real if the image is formed in the direction of ray of light with respect to the lens.

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Choose the correct option)
  1. A ......... lens is used to correct presbyopia.

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  2. Out of the following, which phenomenon does not play a role in the for...

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  3. Where is the image formed in the eye of a person suffering from near-s...

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  4. Which phenomenon is responsible for the twinkling of stars ?

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  5. The phenomenon of ......... of light by the colloidal particles gives ...

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  6. What is the time difference between actual sunset and apparent sunset?

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  7. Which light gets scattered maximum due to atmosphere?

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  8. Which light has minimum speed in glass (prism)?

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  9. When an eye is focussed on a distant object, the focal length of the e...

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  10. How many surfaces does a triangular prism have ?

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  11. The wavelengths of violet, yellow and red light are lambda(v), lambda(...

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  12. For normal vision, the far point is at…………. distance.

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  13. For normal vision, the near point is ............

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  14. Which phenomenon can explain the advance sunrise and the delayed sunse...

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  15. Which of the following phenomena cannot be explained by scattering of ...

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  16. The base of an equilateral triangle ABC is BC. When it is arranged in ...

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  17. The Sun appears white in afternoon. The reason is ..........

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  18. Sea water at more depth appears blue. The reason is …….....

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  19. When the ciliary muscles are relaxed, the eye lens becomes ......... a...

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  20. When the ciliary muscles contract, the eye lens becomes ......... and ...

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