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Find a formula
Optical devices
Telescope
length of telescope, i.e. distance from objective to ocular
l
=
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
focal distance of objective
f
1
=
m
x
Å
nm
μm
mm
cm
dm
m
km
n mile
in
ft
yd
focal distance of ocular
f
2
=
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"
