Question

can someone please explain to me on how to do this?
Use 1 / f = 1 / do + 1 / di to solve for di

1 / (15 cm) = 1 / (45 cm) + 1 / di
1 / (15 cm) - 1 / (45 cm) = 1 / di
0.0444 cm-1 = 1 / di
di = 1 / (0.0444 cm-1)
di = 22.5 cm
Then use hi / ho = - di / do to solve for hi
hi / (5 cm) = - (22.5 cm) / (45 cm)
hi = - (5 cm) • (22.5 cm) / (45 cm)
hi = -2.5 cm

Answer 1

ok so do you want to make sure from your answer do you just want to solve for di and hi ?

Answer 2

by the way for the first question, you have the right answer

you could get this same answer by using the equation di= dof/do-f

it is easier to remember dof/do-f= di

Answer 3

OK thanks so much

Answer 4

no problem if u need more help just tag me