You have told about converging lens but not about diverging lens
Converging lenses have positive optical power, while diverging lenses have negative power. Other things are same.
So, here also -2 < -1, the rules of comparing negative numbers apply here as well.
Call us: 90-26-27-28-29, 9157460799, 02614055508
Or, Fill out the form & get a call back.