A simple single lens camera is used to photograph a man 1.7mtall who is standing

Question

A simple single lens camera is used to photograph a man 1.7mtall who is standing 4.0m from the camera.    (1) if the man's image fills the height ofthe frame of film (35mm), what is the focal length of thelens? Any help would be much appreciated with this! A simple single lens camera is used to photograph a man 1.7mtall who is standing 4.0m from the camera.    (1) if the man's image fills the height ofthe frame of film (35mm), what is the focal length of thelens? Any help would be much appreciated with this!

Explanation / Answer

A simple single lens camera is used to photograph a man 1.7mtall who is standing 4.0m from the camera.    (1) if the man's image fills the height ofthe frame of film (35mm), what is the focal length of thelens? Any help would be much appreciated with this!

magnification=m=size of the image/size of the object=imagedistance/object distance
so 0.035/1.7=v/4
now .v=0.0823m
now f=u*v/u+v=4*0.082/4.082=0.0806m

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