An optical measuring instrument used to determine the focal length of lenses; essentially the same as a focimeter.
From 'focus' + '-meter' (from Greek 'metron'). An alternative form to 'focimeter,' this term is less common but follows the same '-meter' suffix pattern as thermometer, barometer, etc.
Scientists love creating precise names—'focometer' and 'focimeter' are essentially synonyms showing how technical fields can develop competing terms before settling on which one gets used most.
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