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26 Nov 2019
To focus a camera on objects atdifferent distances, theconverging lens is moved toward or awayfrom the film, so a sharpimage always falls on the film. A camerawith a telephoto lens(f = 215.0 mm) is to be focused onan object located firstat a distance of 3.5 m and then at 47.0 m.Over what distance mustthe lens be movable?
Thanks!
To focus a camera on objects atdifferent distances, theconverging lens is moved toward or awayfrom the film, so a sharpimage always falls on the film. A camerawith a telephoto lens(f = 215.0 mm) is to be focused onan object located firstat a distance of 3.5 m and then at 47.0 m.Over what distance mustthe lens be movable?
Thanks!