Recent content by harrypoterfan

$$f = -\frac{-30}{2} = 15$$ solving for ##d_0## in $$f^{-1} = d_i^{-1} + d_0^{-1}$$, $$d_0 = (f^{-1} - d_i^{-1})^{-1}$$ = -36.1364 solving for ##h_i## in $$m = \frac{h_i}{h_0} =-\frac{d_i}{d_o}$$, $$h_i = -d_i\times\frac{h_0}{d_o} = 0.4987$$ I'm told by webassign that it should be negative...