$A$ person is suffering from the defect astigmatism. Its main reason is

  • A
    Distance of the eye lens from retina is increased
  • B
    Distance of the eye lens from retina is decreased
  • C
    The cornea is not spherical
  • D
    Power of accommodation of the eye is decreased

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The image formed on the retina is:

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The ability of the eye to see objects at all distances is called

$A$ person who can see things most clearly at a distance of $10 \, cm$ requires spectacles to enable him to see clearly things at a distance of $30 \, cm$. What should be the focal length of the spectacles?

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