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| bifocal |
in optics, having two focal lengths. [1/3 definitions] |
| compound microscope |
a microscope in which two lenses of differing focal lengths are mounted in an adjustable tube. |
| diopter |
a unit of measure of the refractive power of a lens, equal to the power of a lens with a one-meter focal length. |
| f-number |
the relative aperture of a camera lens, representing the light it will transmit, which is obtained by dividing the focal length of the lens by the diameter of the aperture. |
| trifocal |
of eyeglasses, having three lenses of different focal lengths. [1/2 definitions] |
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