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Power of accommodation is achieved by ch...

Power of accommodation is achieved by changing the _________ of the eye lens.

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focal length
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What is power of accomodation of eye?

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

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

What is 'accommodation of the human eye?

Ciliary muscles help to change the ________ of the eye lens according to the position of the object.

Write few lines about eye lens.

SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Fill in the blanks (Covers whole unit))
  1. The ability of the eye lens to focus nearby as wll as the distant obje...

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  2. is the centre part of the iris.

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  3. Power of accommodation is achieved by changing the of the eye lens.

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  4. The least distance of distinct vision is .

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  5. The tiny dust particles present in the air of the room scatter the bea...

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  6. Cylindrical lenses are also called as lenses.

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  7. Both the defects of vision-myopia as well as hypermetropia can be corr...

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  8. A microsocpe has a convex lens of a short focal length.

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  9. Magnification power of microscope has to times more magnification po...

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  10. Compound microscope has to times more magnification power than simpl...

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  11. A microscope is used to measure very small length with high degree of...

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  12. The least count of a travelling microscope is

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  13. is an optical instrument used to see distant objects.

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  14. The first telescope was invented by in 1608.

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  15. made a telescope to observe distant stars.

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  16. The invented telescope was similar to the astronomical telescope.

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  17. A microscope works based on the principle of vernier.

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  18. The minimum distance required to see the objects distinctly without st...

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  19. is know as long sightedness.

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  20. Aged person cannot see the nearby objects . It is called .

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