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Here is the problem which I am struggling on, please help me!

Problem: For safety reasons, you install a rear-window lens with a - 0.297 m focal length in your van. Before putting the van in reverse, you look through the lens and see the image of a person who appears to be 0.335 m tall and 0.243 m behind the van.

Part I: Determine the distance of the person behind the van?

_________ m

Part II: Determine the height of the person?

___________ m

I need tutor help to solve the above problem.

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