The owner of a van installs a rear-window lens that has a focal length of -0.330

Question

The owner of a van installs a rear-window lens that has a focal length of -0.330 m. When the owner looks out through the lens at an object located directly behind the van, the object appears to be 0.230 m from the back of the van, and appears to be 0.350 m tall. (a) How far from the van is the object actually located, and (b) how tall is the object?

The owner of a van installs a rear-window lens that has a focal length of -0.330 m. When the owner looks out through the lens at an object located directly behind the van, the object appears to be 0.230 m from the back of the van, and appears to be 0.350 m tall. (a) How far from the van is the object actually located, and (b) how tall is the object?

Explanation / Answer

1/0+1/i=1/f 1/o+1/.230=-(1/0.330)

a)so object distance=0.135m

b)m=v/u=.135/0.230=0.350/h1

h1=0.596m

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