How are images in a telescope finite rather than just a point?
98701
If a lens focuses all incoming light to a point, how do we get 2D images?
128954
How can we see objects that are so far away?
85837
What's the difference between real and effective aperture?
66895
A condition for the image of a metrizable space to be metrizable
4695
How can I stop defined points that are not displayed from influencing image size?
60690
Optical microscope magnification limits?
92068
How does the eye perceive a real image?
47999
How do you find out the "sweet spot" of a lens?
101186
What does "frequency" mean in an image?
129613
Why does illuminance stay the same for a given f-stop even when focal length changes?
41934
How do zoom, magnification, and focal length relate?
11130
Is it (theoretically) physically possible to project an image into thin air?
49964
Why is there a clear mirror image off a rough surface at shallow angles?
52368
Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
90408
How to take pictures of reflective spherical objects?
140881
Is there any way to draw an image to use 4 points rather than 3 (perspective warp)
109652
What is the limiting factor in lens construction when it comes to f-stop values?