| 21. | And the short focal length of microlenses allows for little depth of field.
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| 22. | Here, f is the focal length of the lens in centimeters.
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| 23. | So if the focal length is measured in millimeters, the image scale is
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| 24. | Each mirror was angled to the anticipated focal length to the central tower.
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| 25. | View camera lenses are designed with both focal length and coverage in mind.
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| 26. | A typical RHEED source has a focal length around 50 cm.
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| 27. | The objectives for aerial telescopes sometimes had very long focal lengths.
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| 28. | The order is based on the focal length of the lens.
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| 29. | It is used for changing the focal length of the lens.
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| 30. | How can I calculate the focal length of this eyepiece?
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