The relation between focal length F magnification m and image distance v of a spherical mirror of small aperture is given by
![Relationship between Lens Magnification and Lens Length (mm) | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global Relationship between Lens Magnification and Lens Length (mm) | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global](https://av.jpn.support.panasonic.com/support/global/cs/dsc/knowhow/common/img/l13/l13_01.jpg)
Relationship between Lens Magnification and Lens Length (mm) | Digital Camera Know-Hows | Digital Camera | Digital AV | Support | Panasonic Global
![Why larger focal length implies more magnification? - Beginners Forum (No Astrophotography) - Cloudy Nights Why larger focal length implies more magnification? - Beginners Forum (No Astrophotography) - Cloudy Nights](https://www.cloudynights.com/uploads/monthly_12_2015/post-200909-0-89196000-1449020549.jpg)