Question Number 181256 by sciencestudent last updated on 23/Nov/22
$$\frac{\mathrm{1}}{{f}}=\left({n}−\mathrm{1}\right)\left(\frac{\mathrm{1}}{{R}_{\mathrm{1}} }−\frac{\mathrm{1}}{{R}_{\mathrm{2}} }\right)\:\:{lense}'{s}\:{maker}\:{equation}. \\ $$$${when}\:{is}\:{positive}\:{or}\:{negative}\:{R}_{\mathrm{1}} \:{and}\:\:{R}_{\mathrm{2}} ? \\ $$
Commented by sciencestudent last updated on 24/Nov/22
$${thanks}\:{my}\:{heart}! \\ $$
Commented by sciencestudent last updated on 24/Nov/22
$${are}\:{these}\:{right}? \\ $$
Commented by sciencestudent last updated on 24/Nov/22
Commented by JDamian last updated on 24/Nov/22
$${why}\:{have}\:{you}\:{not}\:{searched} \\ $$$${in}\:{google}\:{or}\:{wkipedia}? \\ $$
Commented by JDamian last updated on 23/Nov/22
when lens are concave or convexe
Commented by sciencestudent last updated on 23/Nov/22
$${Please}\:{ans}\:{mr}\:{W}! \\ $$
Commented by mr W last updated on 23/Nov/22
