Valgusfüüsika ja optika seadused määravad, et fookusvahemik võib ulatuda ühest kolmandikust fookuspunkti ees olevast kaugusest kuni sellest kahe kolmandiku võrra kaugemale.
The laws of light physics and optics dictate that the focus range can extend from one-third of the distance in front of the focal point to two-thirds beyond it.
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