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anizet
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Homework Statement
A convex lens (f1=300mm) is placed 200 mm from a concave lens (f2=-50mm). An object is placed 6m away form the convex lens. (the order is as follows: object - 6m - convex lens - 200mm - concave lens).
Determine the position, magnification and nature of a final image.
Homework Equations
for a single lens:
1/x+1/y=1/f (where x is distance from the lens to the object, y is the distance from the lens to the image),
The Attempt at a Solution
Should I analyze 2 lenses separately?
At first first lens, which gives the image at y1:
1/6m+1/y1=1/300mm
y1=~31.5cm, so it is placed behind the second lens! Should I now consider the second lens, starting from the point, where is the image? I mean:
1/x2+1/y2=1/f2
where x2=20cm-31.5 cm=-11.5cm ?
I'm a little bit confused..
And finally, how to calculate the magnification?