the owner of a van installs a rear-window lens that has afocal length of -0.300

Question

the owner of a van installs a rear-window lens that has afocal length of -0.300 m. when the owner looks out through thelens at a person standing directly behind the van, the personappears to be just 0.240m from the back of the van, amdappears to be 0.34 m tall. (a) how far from the van is the person actuallystanding, and (b) how tall is the person? the owner of a van installs a rear-window lens that has afocal length of -0.300 m. when the owner looks out through thelens at a person standing directly behind the van, the personappears to be just 0.240m from the back of the van, amdappears to be 0.34 m tall. (a) how far from the van is the person actuallystanding, and (b) how tall is the person?

Explanation / Answer

(a) we have 1/-0.3=1/-0.24 +1/d => d=1.2 m the image is virtual (b) the person tall: h=0.34*1.2/0.24=1.7 m

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