An object is held 99.5 cm away from a mirror. The mirror has afocal length of 72
ID: 1677995 • Letter: A
Question
An object is held 99.5 cm away from a mirror. The mirror has afocal length of 72.9 cm.
a.) Determine the image distance.
1 cm
b.) Determine the magnification.
2
c.) If the object is 9.8 cm long, determine the image height.
3 cm
d.)Which of the following are true about the image? Choose all thatapply.
4
The image is virtual.
The image is upright.
The image is inverted.
The image is real.
a) The image distance
q =pf / p -f = 99.5*72.9 / 99.6-72.9 = 272.69 cm
(b) Magnification m = -q/p = -272.69 / 99.5 = - 2.74
(c) magnification m = hf / hi
-2.74 = hf / 9.8
hf = -26.85 cm
Explanation / Answer
a) The image distance
q =pf / p -f = 99.5*72.9 / 99.6-72.9 = 272.69 cm
(b) Magnification m = -q/p = -272.69 / 99.5 = - 2.74
(c) magnification m = hf / hi
-2.74 = hf / 9.8
hf = -26.85 cm
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