When using a shaving mirror with a focal length of 72 cm to view the image the face, if the face is 18 cm from the mirror, determine the image distance and the magnification of the face.
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Answered by
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Using the two relationships on mirrors: -
1/do+1/di =1/f
where
d is the distances of object and image from the mirror and
f is the mirror`s focal length
The magnification
m = − di/do
Thus, 1/18+1/di = 1/72
di = -24cm negative and virtual
m = -(-24/ 18) = 1.33
Thus, 1.33 times the object and positive (upright).
Answered by
2
Answer:
Using the two relationships on mirrors: -
1/do+1/di =1/f
where
d is the distances of object and image from the mirror and
f is the mirror`s focal length
The magnification
m = − di/do
Thus, 1/18+1/di = 1/72
di = -24cm negative and virtual
m = -(-24/ 18) = 1.33
Thus, 1.33 times the object and positive (upright).
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