Subject Magnification

The subject magnification factor is how much the subject is enlarged.

The subject magnification factor equals the focal length divided by the difference between the subject distance and the focal length.

Formula

QuantityVariable["M", "Unitless"] == QuantityVariable["f", "Length"]/(-QuantityVariable["f", "Length"] + QuantityVariable["s", "Length"])

symbol	description	physical quantity
M	subject magnification factor	"Unitless"
f	focal length	"Length"
s	subject distance	"Length"

Get the resource:

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Get the formula:

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Use some values:

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