8m Picture
Posted on Thursday, November 26, 2009 in Digital Photo Frames
8m Picture
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I need help finding distance and focal length....?
The dimensions of the pictures on a slide are 6.4cm by 7.6 cm. This slide is to be projected to form an image 1.5m by 1.8m at a distance of 9.0m from the objective lens of the projecter.
What is the distance from the slide to the objective lens?
What focal length objective lens must be used?
Object distance / Image distance = Object height / Image height
Object distance / 9.0 = 0.064 / 1.5
Object distance( u ) = 9 . 0.064 / 1.5 = 0.384 m
f = u . v / ( u+ v) = 0.384 . 9 / 9.384 = 0.3683 = 0.37 m
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