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For a normal eye, distance of near point...

For a normal eye, distance of near point from the eye is.

A

`oo`

B

`25 cm`

C

`25 m`

D

none of these

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The correct Answer is:
B
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What happens to the image distance in the eye when we increase the distance of an object from the eye ?

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For a normal eye, the far point is at infinity and the near point of distinct vision is about 25 cm in front of the eye. The cornea of the provides a converging power of about 40 dioptre and the least converging power of eye lens behind the cornea is about 20 dioptre . From this rough data, estimate the range of accommodation (i.e., the range of converging power of the eye lens) of a normal eye.

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PRADEEP-OPTICS-Exercise
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  2. In all optical instruments, we use.

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  3. For a normal eye, distance of near point from the eye is.

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  4. The lens used for correcting myopia is.

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  5. The correct formula for magnifying powerof a simple microscope is.

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  6. In a compound microscope, the distance between objective lens and eye ...

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  7. For a total magnification of 175 from a compound microscope, the magni...

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  8. The final image in a astronomical telescope (w.r.t. object) is.

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  9. A telescope uses an objective lens of focal length f0 and an eye lens ...

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  10. What focal length should the reading spectacles have for a person whos...

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  11. An astronomical telescope has a magnifying power of 10. In normal adju...

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  12. A myopia eye can see clearly………but the………cannot be seen distinctly.

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  13. A myopia eye can see clearly………but the………cannot be seen distinctly.

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  14. Presbyopia is also called………. .

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  15. For a normal eye, the least distance of distinct vision is……..and far ...

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  16. Magnifying power of a simple microscope is defined as the………of angles…...

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  17. In a compound microscope, the objective lens and……..are………. .

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  18. Focussing in a compound microscope is carried out by changing the……..f...

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  19. In an astronomical telescope, the distance between……….and…….can be var...

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  20. In normal adjusment of telescope, final image is……. . And distance bet...

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