Image Height
Question:
How big should the mirror be
so that your whole body is visible?
Instructions:
1. Face
the mirror. Adjust the black curtain on both ends of the
mirror so that the image of your whole body is just visible.
2.
Read the height of the mirror from the ruler next to it.
What is the relation between the your height and that
of the mirror?
Why?
The image formed by a plane
mirror has the same size as the object. It is also equally
distant from the mirror as the object. Therefore, looking
into a mirror is actually equivalent to looking through
a window at another "you". Using simple trigonometry,
we can easily find that the height of the mirror required
is just one-half of your body height. Please note that
the mirror should be placed as shown in the diagram.
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