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4MWXXa - 1
Calculation: 4MWXXa - 1
1
/
d
+
1
/
f
=
2
/
R
1
/
d
+
1
/
f
=
2
/
R
1
d
+
1
f
\frac{1}{d}+\frac{1}{f}
d
1
+
f
1
=
2
R
\frac{2}{R}
R
2
1
/
d
=
2
/
R
-
1
/
f
1
d
\frac{1}{d}
d
1
=
2
R
−
1
f
\frac{2}{R}-\frac{1}{f}
R
2
−
f
1
d
=
1
/
(
2
/
R
-
1
/
f
)
d
d
d
=
1
2
R
−
1
f
\frac{1}{\frac{2}{R}-\frac{1}{f}}
R
2
−
f
1
1
