UniCalc
RU
full version
Own formula
Calculation
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Find a formula
Lenses
Lens formula
focal distance
f =
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
distance to object
g =
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
distance to image
b =
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"
