C-08-Q118mediumsingle_mcqদর্পণের সমীকরণ—a1u+1v=1f\dfrac{1}{u} + \dfrac{1}{v} = \dfrac{1}{f}u1+v1=f1b1u−1v=1f\dfrac{1}{u} - \dfrac{1}{v} = \dfrac{1}{f}u1−v1cu+v=fu + v = fu+v=fduv=fuv = fuv=f