Driver function
R = 30 ; NEW_LINE print ( " Focal ▁ length ▁ of ▁ spherical ▁ concave ▁ mirror ▁ is ▁ : " , focal_length_concave ( R ) , " ▁ units " ) NEW_LINE print ( " Focal ▁ length ▁ of ▁ spherical ▁ convex ▁ mirror ▁ is ▁ : ▁ " , focal_length_convex ( R ) , " ▁ units " ) NEW_LINE