A person whose eyes are 1.85 m above the floor stands in front of a plane mirror. The top of her head is 0.11 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?
2007-05-17 02:47:08 · 2 answers · asked by Alan l 1 in Science & Mathematics ➔ Physics
And how far away is the person from the mirror? LOL
Assuming the floor is horizontal and the mirror hangs vertically.
(a) Lets do (b) first
(b)The mirror must be halfway between the horizontal line of sight and the floor
h= 1.85/ 2= .95m or 95 cm
now let's continue with the (a) by considering the upper limit.
The upper limit is U=1.85 + .11= 1.96m
So the mirror's height is
U - h= 1.96m - .95m=1.01 m (is the height of the shortest mirror regardless of distance the observer is away from the mirror.)
2007-05-17 03:03:03 · answer #1 · answered by Edward 7 · 2⤊ 0⤋
Bad question. How far away is the mirror? .... This isn't really physics... unless you want to add in light affects or something.
2007-05-17 03:21:07 · answer #2 · answered by Anonymous · 0⤊ 2⤋