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Which defect of the eye occurs due to di...

Which defect of the eye occurs due to distortion of cornea ?

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Astigmatism occurs due to the distortion of cornea.
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The eye can be regarded as a single refracting surface. The radius of curvature of this surfac is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 an 1.34. Calculate the distance from the refracting surface at which a parallel beam of light wil come to focus.

KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in very short as directed (Miscellaneous) )
  1. What is the focal length of plain goggles ?

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  2. What happens when elasticity of the crystalline lens is reduced to zer...

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  3. Which defect of the eye occurs due to distortion of cornea ?

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  4. How the defect of astigmatism can be corrected ?

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  5. What is colour blindness? How can it be cured?

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  6. In hypermetropia, how does the size of eyeball change ?

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  7. What change occurs in the focal length, when our eye lens becomes thic...

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  8. What are rods and cones ?

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  9. What is cataract ?

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  10. What would have been the colour of the sky, had there been no atmosphe...

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  11. Due to which phenomenon is the colour of water in deep sea blue ?

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  12. What is the cause for presbyopia ?

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  13. Give the relationship between wavelength of light and its angle of dev...

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  14. For which colour has the glass larger refractive index – violet or gre...

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  15. Which part of human eye is also known as 'white of the eye' ?

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  16. Why is blind spot so called ?

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  17. Which liquid is filled in the space between the eye lens and the retin...

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  18. What happens to the pupil of the eye when the light is (a) very bright...

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  19. A man is wearing spectacles of focal length +1 m. What can be the defe...

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  20. Which portion of a bi-focal lens is (a) a concave lens (b)a convex l...

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