Which lens power has the shortest focal length?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which lens power has the shortest focal length?

Explanation:
Lens power in diopters is the reciprocal of the focal length in meters (P = 1/f). So, the higher the diopter value, the shorter the focal length. Compute each quickly: - 1.50 D → f ≈ 0.667 m - 2.50 D → f ≈ 0.400 m - 3.00 D → f ≈ 0.333 m - 4.50 D → f ≈ 0.222 m The lens with the largest diopter value has the shortest focal length, so 4.50 diopters corresponds to the shortest focal length.

Lens power in diopters is the reciprocal of the focal length in meters (P = 1/f). So, the higher the diopter value, the shorter the focal length.

Compute each quickly:

  • 1.50 D → f ≈ 0.667 m

  • 2.50 D → f ≈ 0.400 m

  • 3.00 D → f ≈ 0.333 m

  • 4.50 D → f ≈ 0.222 m

The lens with the largest diopter value has the shortest focal length, so 4.50 diopters corresponds to the shortest focal length.

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