The owner of a van installs a rear-window lens which, Ask an Expert

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The owner of a van installs a rear-window lens which consists of a focal length of -0.290 m. If the owner looks out via the lens at an object situated directly behind the van, the object seems to be 0.260 m from the back of the van, and appears to be 0.340 m tall. (i) Explain how far from the van is the object in reality positioned, and (b) determine how tall is the object?

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