How To Use Focal distance In A Sentence

Huygens discovered the law of refraction to derive the focal distances of lenses.
This kind of liquid state lens are composed of a pair of waterdrop , they expose under the high frequency sound wave travel between the vibration, changes lens' focal distance along with it.
Despite the vogue for very short focal distances, in glossy shots of food, for example, he insists on sharpness throughout.
The participants responded that they experienced more eye strain and fatigue from the video with different vergence and focal distances, a feature of 3D that has long been supposed to cause eye strain. Ars Technica
This may avoid remedy mistake because of the actual different focal distance brings from AS function.

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A common practice in ORs is to raise or elevate the surgical bed to accommodate the surgeon's height and focal distance after the drapes have been applied.