Optics Problem: What optical instrument does this?

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The discussion centers on identifying an optical instrument, with a focus on telescopes. Participants express concerns about image distortion when plane waves arrive at different angles, questioning whether spherical lenses could be a factor. The need for sketches to visualize the problem is suggested. Additionally, there is inquiry into the convergence point of plane waves. The conversation highlights the complexities involved in understanding optical principles related to telescopes.
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Homework Statement
Imagine you are using this (2 converging lens system) to image a stellar object with an angular spread of α. (This means, that the object is so far away, that the rays coming from the top of the object arrive at the lens system as plane waves at one angle, and the rays coming from the bottom of the object also arrive at the lens system as plane waves, but at a different angle, and the difference between those angles is α.
Describe the characteristics of the “image”. What optical instrument does this remind you of?
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Im thinking that this is a telescope, but I am having a lot of trouble answering this question.

If the plane waves arrive at different angles, wouldn't the image be distorted?Would the lenses possibly be spherical because of this?
 
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Make some sketches. Where do plane waves converge ?
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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