Calculating Tree Height with a 5cm Mirror

[sofianets]

Homework Statement

A 5cm mirror is just large enough to show the whole image of a tree when held 20 cm from the eye of the observer whose distance to the tree is 100 m. What is the height of tree?

Homework Equations

n/a

The Attempt at a Solution

n/a

 

[tiny-tim]

welcome to pf!

hi sofianets! welcome to pf!

A 5cm mirror is just large enough to show the whole image of a tree when held 20 cm from the eye of the observer whose distance to the tree is 100 m. What is the height of tree?

start by drawing the image

(and the mirror and the eye and the tree, of course)