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mikehibbert
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[SOLVED] Simple Optics - being stupid?!
There's an object 1.5m from a white screen. What is the focal length of a lens needed to form a real and inverted image on the screen with magnification of 4.0?
How far from the object should the lens be placed?
-M=S'/S
1/f=1/S'+1/S
My problem is the first part of the question, what to use for S and S', surely there are an infinite number of possibilities?
Homework Statement
There's an object 1.5m from a white screen. What is the focal length of a lens needed to form a real and inverted image on the screen with magnification of 4.0?
How far from the object should the lens be placed?
Homework Equations
-M=S'/S
1/f=1/S'+1/S
The Attempt at a Solution
My problem is the first part of the question, what to use for S and S', surely there are an infinite number of possibilities?