Recent content by Grekory

It's just made up values and i want to know how i would solve for di. The negative in the formula confuses me

When I'm given do, ho, and hi. How would i solve for di Normally i would do -di/do = hi/ho and cross-multiply but I'm not sure how the negative comes into effect. do = object distance di = image distance ho = object height hi = image height If... ho = 3cm hi = 4cm do = 5cm...