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Ophthalmic Assistant

Category - Keratometry, Tonometry, and Refractometry

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What is the focal length of a 4.00 D lens?

0.33 m
0.5 m
1.0 m
0.25 m

Explanation

Answer: D - 0.25 m

The focal length of a 4.00 D lens is 0.25 m. To find the focal length of a lens, simply divide 1 by its power. The formula is: F in meters = 1/D

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