Dear all,
I have quite a naive question but I can't manage to really figure the explanation and even if my assumption is true.
let's suppose you have an object, a lens and the object image ; with
the object at the exact same location if you turn the lens backwards
so so frontal face is now the back, will the image be the same as
before ?
I presume that for a thin simple lens this is true, but I also guess
that it's not true for more complex optical systems which do not
behave the same if you return them backwards.
But I also think that the reason why it is so is due to reversibility
of light, so that I'm confused because thsi principle should work in
both situations wether with a simple thin lens or with a complex
systems with multiple elements (like a microscope or a telescope).
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