Which of the following has no unit?
Magnification
Magnification is defined as the ratio of the image size to the object size (or image distance to object distance). Because it is a ratio of two like quantities, the units cancel and magnification is a pure number without any unit.
Focal length is a length and is measured in metres, the power of a lens is measured in dioptres (reciprocal of focal length in metres) and the power of accommodation of the eye is also expressed in dioptres. Hence, Magnification.
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