Tagged Questions
1
vote
2answers
159 views
Light Ray Reflection from concave mirror
Suppose a ray of light hits a concave mirror and is parallel to principle axis but far away from it such that it doesn't follow paraxial ray approximation. Will it pass through focus or between focus ...
1
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2answers
99 views
Why don't you see multiple images of an object?
Consider the ray model of light. Let's say an object such as a pencil is illuminated, and consider one point on that pencil. Since there could be many rays of light bouncing off the same point on the ...
0
votes
1answer
63 views
Which fraction of light is refracted from a source of light under a lake?
I was trying to solve this problem:
"A punctiform source of light is standing inside a lake, at a height h of the surface. f is the fraction of the total of energy emitted that escapes directly from ...
-1
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4answers
115 views
What does the wave principle of light actually represent?
Light has a dual nature, one of photons and the other of waves. But energy doesn't really travel in waves. So what do the wave represent?
1
vote
0answers
330 views
How to use the Coddington shape factor?
We are given $\sigma=\frac{r2+r1}{r2-r1}$, with $\sigma$ being the Coddington shape factor. What I am having problems with is solving for $r1$ and $r2$ when I am just given a focal length and a ...
131
votes
14answers
42k views
A mirror flips left and right, but not up and down
Why is it that when you look in the mirror left and right directions appear flipped, but not the up and down?
