Identify the wrong description of the above figures.

  • A
    $1$ represents far-sightedness.
  • B
    $2$ represents correction for short-sightedness.
  • C
    $3$ represents far-sightedness.
  • D
    $4$ represents correction for far-sightedness.

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When we see an object,the image formed on the retina is

$A$ man can see only between $75 \, cm$ and $100 \, cm$. The power of the lens required to correct the near point will be:

The impact of an image on the retina remains for......$sec$.

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