A person whose eyes are 1.70 m above the floor stands in front of a plane mirror. The top of her head is 0.13 m above her eyes.
(a) What is the height of the shortest mirror in which she can see her entire image?
(b) How far above the floor should the bottom edge of the mirror be placed?
2007-03-10 04:13:25 · 3 answers · asked by layc_510 2 in Science & Mathematics ➔ Physics
The mirror should be half of 1.7 m + half of .13 m, so that means it should be .915 m. This is because the angle of incidence equals the angle of reflection. And the mirror should be placed half of 1.7 m above the floor for the same reason. And it doesn't matter how far the person stands from the mirror since it's a plane mirror.
Your answers are:
a) .915 m
b) .85 m
2007-03-13 15:09:42 · answer #1 · answered by smartdude474 2 · 0⤊ 0⤋
By placing the mirror far enough away, the size of the mirror can be arbitrarily small. Without knowing the distance to the mirror, the question cannot be answered.
2007-03-10 04:41:48 · answer #2 · answered by Keith P 7 · 0⤊ 1⤋
Do your own homework.
2007-03-10 04:20:35 · answer #3 · answered by Anonymous · 0⤊ 1⤋