As we know from a school physics course, the focal length of a thin lens can be calculated using the following formula:
F = 1 / D, where D is its optical power.
Let’s determine how many meters the focal length of our lens will be expressed, when from the condition of the task we know that its optical power is -2.5 diopters:
F = 1: (-2.5) = -0.4.
Answer: With such initial data, the focal length of a thin lens will be -0.4 m.
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