- #1
Maria H
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Homework Statement
A building will be photographed with a camera.
The distance is 490 m to the building.
The building height is 85m and width 40m.
You can choose between 35mm, 50mm, 135mm and 250mm lenses (focal length of lenses).
Select the lens that gives the largest image of the building (whole building should be in the movie). The film has a frame on 24mm36mm.
a) Which lens do you choose?
b) How large is the image of the building? Reply with rounded integer.
c) How large is the distance between the lens and film? Suppose that the lens thickness is negligible. Reply with two decimal places.
Homework Equations
1/a+1/b=1/f
1/a=1/b
h/H=c/d(?)
The Attempt at a Solution
40/0,036=1111,111.. 490/1111,111=0,411 (focal length 411?) I think I'm lost already here.
Or,
1/40+1/0,036=1/f f=0,0359.. (I'm not sure if this means that 35mm is right or if 50mm is better since it 35,9mm)
I'm not sure how to use h/H right know.
I would be so happy if someone could help me!
/Maria