Measuring magnification

[hellogreen]

How to Measure magnification

How can I see how strong a magnifying glass is?

 

 

I bought this magnifying glass http://www.liangdianup.com/inventory/189901.htm and I want

 

to know how to test it to see how strong it is. I hear a lot of people talk about

 

magnifying and how strong the magnification is, but I would like to know the true

 

magnification of my magnifying glass. I have a few of them and some seem stronger then

 

others. How can I rate these? How can I pin a correct number on mine? How do the companies

 

that make these come up with these numbers.

[swansont]

How much bigger does an object appear to be in the magnifying glass than with the naked eye, when they are the same distance from your eye? (Usually 25 cm is used, as a convention, for this measurement)