Multiple choice general knowledge science & technology

Unit of Focal Length

  1. m/s

  2. m^-1

  3. m

  4. m2
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C Correct answer
Explanation

Focal length measures the distance from the lens's optical center to the focal point where light converges. Distance is measured in meters (m) in SI units. m/s is velocity, m^-1 is diopter (used for lens power), and m² is area.

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