In the following problem, I am having trouble understanding the components. - The image of a man just covers the length of a 5cm plane mirror when the mirror is held vertically 30cm from the eye. The tree is 100m from the mirror. What is the height? * To find the height you would use hi/ho = -i/o and you would also use 1/i + 1/o = 1/f to find these components. But I can not understand what the measurements mean in the question. The object would be the tree, 100m from the mirror. What are the other two (5cm and 30 cm) Can I use the hi/ho formula directly for this problem?