Ace the COT Challenge 2025 – Shine Bright as a Certified Ophthalmic Technician!

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A +12 D lens is designated as a magnifier of what power?

x2

x3

To determine the magnifying power of a +12 D lens, it is essential to understand the function of lenses and how their power is related to magnification. The power of a lens in diopters (D) is the inverse of its focal length measured in meters. A +12 D lens has a focal length of 1/12 meters, or approximately 0.083 meters, which is around 8.3 cm.

The magnification produced by a simple magnifying lens can be estimated using the formula for magnification (M), which is equal to the focal length of the lens in cm plus the distance at which the lens is held from the objective, typically around 25 cm for a relaxed eye view. However, in a more straightforward approach, the approximate magnification of a lens can also be calculated from its diopter value using the formula:

M = (1 + (D/4)).

For a +12 D lens, this calculation would yield:

M = 1 + (12/4) = 1 + 3 = 4.

Thus, a +12 D lens is a magnifier of approximately x4 power, indicating that the correct choice corresponds to a magnification of 4 times. This

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x4

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