The magnification of a magnifying glass is directly related to the focal length. First measure the focal length of the magnifying glass (when the light converges into a spot in the sun, measuring with a ruler is the simplest method). When the convex lens is used as a magnifying glass, the magnification is approximately equal to the apparent distance.
(
about
25 cm)
Focus ratio. For example, the focal length of a magnifying glass is
10cm
, the angle magnification is
2.5
Second, usually writing.
2.5 times
. So it is not difficult to get the magnification of the magnifying glass through simple calculation. The formula is: magnification = 25/ focal length.
(Unit: cm)