Sorry for posting this post in two different place, I could not decide where is the best place to post it.
I am trying to build a Galilean beam expander/contraction using a plano-convex and plano-convace lenses. My question is how should I arrange them to reduce the spherical aberration...
Been reading about aberration and two explanations that diverge - classical and relativistic. at speeds much slower than c the angle is very small for either formulation. the stellar aberration that led Bradley to the explanation 300 years ago is less than a minute of arc. Has there been any...
Last month I asked here whether there's a consensus about Van Flandern's speculations about the speed of gravity. I quickly learned that he's not well-regarded. Fine. I was hoping to be able to get something out of Steve Carlip's explanation for how GR explains the apparent almost...
I'm interested in the prehistory of the history of relativity. In this
history the nature of light and the ether comes in. One phenomenon that
was debated in this context was stellar aberration: that the positions
of the stars in the sky change slightly, or, more precisely, the
perceived...
How does spherical aberration cause an image to appear when the object is placed at the focus?
In theory, when the object is placed at the focus, no image should appear but when i did an experiment with a concave mirror and a candle, image did appear. But the image was very very far away...
Concave mirror experiment
We did an experiment with a concave mirror
Concave mirror was placed on optics bench and a candle was placed at designated spots. A screen was used to see where the image was projected. But a strange thing happened. When the object was placed at the focal point, image...
I have been trying to determine the change in angle required for a telescope due to the aberration of starlight when it is filled with water. The empty telescope is easily done with the law of sines.
The starlight reaches Earth at an arbitrary angle of theta from the vertical with a speed of...
What is the approximate difference in the points of convergence between red and blue light when using a spherical lens? Is it negligible (i.e. less than a millimeter)? Is it a specific distance or is it a function of a separate variable?
Essentially, I'm curious as to why the focal length of a lens with red light is the closest to the focal length in white light.
MY ATTEMPTED ANSWER:
According to the lens-maker's equation, the focal length of a lens depends on the index of refraction of the lens material, which in turn is...
I was thinking of something and maybe somebody can explain...
If rain is coming straight down at a rate of 4 meters/second and I'm walking along at a rate of 3 meters/second then the rain is hitting me at an angle at a rate of 5 meters/second. So, then why doesn't the same sort of reasoning...