Assertion: telescope's magnification | /r/HasProperty | the ratio
Facets:
value: between its size in an image
type: OTHER
value: between its true size
type: OTHER
Source sentences:
text: Optical magnification is the ratio between the apparent size of an object (or its size in an image) and its true size, and thus it is a dimensionless number.
text: angular magnification: a ratio related to the focal lengths of the objective and eyepiece and given as [latex]M=-\frac{{f}_{\text{o}}}{{f}_{\text{e}}}\\[/latex]
text: By convention, for magnifying glasses and optical microscopes, where the size of the object is a linear dimension and the apparent size is an angle, the magnification is the ratio between the apparent (angular) size as seen in the eyepiece and the angular size of the object when placed at the conventional closest distance of distinct vision: 25 cm from the eye.