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  • Optical Instruments: Telescopes & Microscopes
  • The focal length of a normal eye lens is about
Multiple choice

The focal length of a normal eye lens is about

  1. 1 mm

  2. 2 cm

  3. 25 cm

  4. 1 m

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The distance from the eye lens to the retina is approximately 2 cm to 2.5 cm. For a normal eye to focus distant objects clearly on the retina, the focal length of the eye lens must be approximately equal to this distance.

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