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kHvAFt - 1
Calculation: kHvAFt - 1
1
/
d
+
1
/
f
=
2
/
R
1
/
d
+
1
/
f
=
2
/
R
$$\frac{1}{d}+\frac{1}{f}$$
=
$$\frac{2}{R}$$
1
/
d
=
2
/
R
-
1
/
f
$$\frac{1}{d}$$
=
$$\frac{2}{R}-\frac{1}{f}$$
d
=
1
/
(
2
/
R
-
1
/
f
)
$$d$$
=
$$\frac{1}{\frac{2}{R}-\frac{1}{f}}$$
