The writing on the passenger-side mirror of your car says \"Warning! Objects in
ID: 1631713 • Letter: T
Question
The writing on the passenger-side mirror of your car says "Warning! Objects in mirror are closer than they appear" (Figure 1) . There is no such warning on the driver's mirror. Consider a typical convex passenger-side mirror with a focal length of -80 cm. A 1.5-m-tall cyclist on a bicycle is 29 m from the mirror. You are 1.4 m from the mirror, and suppose, for simplicity, that the mirror, you, and the cyclist all lie along a line.
a. How far are you from the image of the cyclist?
b. How far would you have been from the image if the mirror were flat?
c. What is the image height?
d. What would the image height have been if the mirror were flat?
Explanation / Answer
From the given question,
focal length of mirror(f)=-80 cm=-0.8 m
height of object(ho)=1.5 m
object distance(u)=29 m
from the mirror formula,
1/u + 1/v=1/f
1/29 + 1/v = 1/(-0.8)
v=-0.79 m=- 79 cm
a.Image of cyclist from you=1.4 + 0.79=2.19m
b.If mirror was flat, Image of cyclist from you=1.4+29=30.4m
c.Image height=(0.79/29)*(1.5)=0.04m =4 cm
d.If mirror was flat, image height=1.5 m
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