δ φ = \frac{δ}{f} = \frac{10^{- 5}}{5 \cdot 10^{- 2}} = 2 \cdot 10^{- 4} r a d

${\delta \varphi = \frac{\delta }{f} = \frac{10^{-5}}{5 \cdot 10^{-2}} = 2 \cdot 10^{-4} \, \mathrm{rad}}$

Error