Height of the image of my friend on the film

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SUMMARY

The discussion centers on the calculation of the height of an image based on a distance of 29 meters. The initial conversion of 29 meters to millimeters was incorrectly executed, leading to an erroneous height of 0.054 mm. Participants emphasized the importance of accurate unit conversion and the need to verify the calculation of the image distance, denoted as ##d_i##, to ensure correct results.

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syllll_213
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Homework Statement
You have a movie camera with a single lens of focal length 98 mm. You would like to take a picture of a friend who is standing 29 m away. Your friend is 155 cm tall, what is the height of the image of your friend on the film in mm?
Relevant Equations
1/f+1/di+1/do
1744710442452.png

Hi, I just want to check if my working is correct cuz I seems to get the wrong answer in my first attempt by inserting 0.054mm as the heigh.... the height seems a bit small to me.
 
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Check again your conversion of the 29 m distance into cm.
And make sure you get the distance image in the last step.
 
nasu said:
Check again your conversion of the 29 m distance into cm.
All conversions were to mm.
syllll_213 said:
Check your calculation of ##d_i##. There is something you forgot to do.
 
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