Dioptre is a unit of measurement for __________ ?
Correct answer: B. Lens
- A. Current
- B. Lens
- C. Force
- D. Focal Length
Explanation
A dioptre is the unit of optical power of a lens, equal to the reciprocal of its focal length in metres. Thus a lens with a focal length of 0.5 metre has a power of 2 dioptres.
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Everyday physics explains motion, force, work, power, pressure, heat, light, sound and electricity through familiar devices and natural events. Topics include simple machines, friction, expansion, reflection and refraction, lenses, household circuits, electrical safety and magnetism, with mass distinguished from weight and heat distinguished from temperature.
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