Solve the Problem $$\mathrm { f } = \frac { \mathrm { f } _ { 1 } \mathrm { f } _ { 2 } } { \mathrm { f } _ { 1 } + \mathrm { f } _ { 2 } }$$

Essay

Solve the problem.
-When two lenses are placed next to each other, their combined focal length (a measurement that can be negative or
positive) is described by the equation $$\mathrm { f } = \frac { \mathrm { f } _ { 1 } \mathrm { f } _ { 2 } } { \mathrm { f } _ { 1 } + \mathrm { f } _ { 2 } }$$ If $$\mathrm { f } _ { 1 } = 0.001$$ 01, what are the asymptotes of this function?