OpenStudy (anonymous):
a 180cm tall boy wants to buy a mirror that is a tall enough so he can see his height in the mirror what is the minimum lentgh of such a mirror
OpenStudy (wolfe8):
Welcome to OpenStudy. Well, it depends on how far he is standing from the mirror if he wants to see his full height. But if it means he wants to be able to see 180 cm of him in the mirror, then what do you think?
OpenStudy (anonymous):
Imagine looking at an arbitrarily tall mirror. Regardless of how far away from it you are, the vertical position of where the image of your feet appears will be half way between your eyes and your feet, because incident and reflected angles are equal. Likewise, the vertical position of where the image of the top of your head appears will be half way between your eyes and the top of your head. The distance between these images is just half your height.
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