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The owner of a van installs a rear-window lens that has a focal length of -0.301 m. When the owner looks out through the lens at a person standing directly behind the van, the person appears to be just 0.242 m from the back of the van, and appears to be 0.343 m tall.(a) How far from the van is the person actually standing?(b) How tall is the person?

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Answer:a)= 1.2315m

b) =1.74m

Explanation: 1/F = 1/V -1/ U

F= -0.301

V=?

U=0.242

We are looking for V. So making V the change of subject of formula we have 1/V = -1/0.301 + 1/0.242

1/V = 0.812

V= 1.2315m

b) image height /object height = image distance /object distance

0.343/H = 0.242/1.2315

H = 0.343/0.197

H= 1.74m

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