# physics

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A person stands in front of a mirror at an amusement park. the person is left of a mirror. the mirror shows an upright image of the person that seems to be 4.0 meters behind the mirror. assume the image is 3.5 times the person's height.
a) is the image virtual or real ? explain.
b) what is the focal lenght of the mirror?
c) is the mirror concave or convex?
d) sketch the mirror on the right of the person . draw the image by ray racing as we did in class. ray trace by drawing two rays from the tip of the arrow, one parallel to the axis and the other intersecting the point where the mirror crosses the axis. label the object distance d0 and the image distance d1 .

• physics -

Magnification M = di/do =3.5,
do = di/3.5 = 4/35.4 =1.14 m,
1/f =1/di + 1/do =
= 1/1.14 – ¼ = 0.625,
f =1.6 m.
This is the concave mirror.

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