Translation of "lens focal length" into Russian

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lens focal length noun
pl. lens focal lengths


L1 = achromatic lens focal length between 20 and 50 mm. L1- фокусное расстояние ахроматической линзы от 20 до 50 мм;
The advantage of the Kornet’s charge design is that the motor’s positioning allows for the second charge’s focal length to be increased, allowing for a greater distance in which the molten jet formed by the second HEAT charge to form. Преимущества боевой части «Корнета» заключаются в том, что благодаря такой схеме размещения обеспечивается необходимое фокусное расстояние при формировании кумулятивной струи, что увеличивает ее длину.
But this is a five-meter telescope - has about a quarter-mile focal length. Но этот пятиметровый телескоп имеет 400 метровое фокусное расстояние.
And then he said, "This is the focal length." Потом он сказал: "Это фокусное расстояние".
What does that focal length do? Что же делает это фокусное расстояние?

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