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Physics Optics- Need help please?
You are contemplating the purchase of a "telescopic" lens for your reflex camera so that you can take pictures of birds from a distance that does not disturb them. The lens you are looking at is specified to be able to zoom to a focal length of 450 mm. With this lens from what distance could you photograph a bird that is 115 mm tall so that the height of its image would just fill the 35 mm dimension of a standard 25 x 35 mm film negative? Give the distance of the bird as its distance from the lens, in meters.
Thanks
Hello
Object/Image = Di/Do = (Di - f)/f = f/(Do - f)
35/115 = 450/(Do - 450)
0,3043 = 450/(Do - 450)
0,3043(Do - 450) = 450
0,3043Do = 450 + 0,3043*450
Do = 1928,8 mm = 1,928 m
-----------------------------------------------
Control:
Di = 1,928*35/115 = 587 mm
1/f = 1/Do + 1/Di
1/450 = 1/1928 + 1/587
0,0022222 = 0,0005186 + 0,0017035 = 0,0022222
Regards
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