Why is it that we prefer to use magnifying power instead of magnification for optical instruments like microscopes and telescopes?
and magnifying glass:Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one it refers to a reduction in size, sometimes called "minification" or "de-magnification".
It looks like Magnification is the PROCESS of magnifying something, while magnifying power is a way to measure the magnification.The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. The magnifying power is equivalent to angular magnification (this should not be confused with optical power, which is a different quantity) The magnifying power is the ratio of the sizes of the images formed on the user's retina with and without the lens