All Questions
Tagged with optics geometric-optics
1,082
questions
1
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2
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919
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Is there a known optical design for a beam compressor?
With my little knowledge of optics I have come across some 'known' designs such as the Double Gauss for example, is there a 'beam compressor'.
My requirements are to reduce an incoming parallel ...
- 3,867
1
vote
2
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441
views
Intensity loss due to vignetting
I was trying to get an expression for the loss of intensity due to vignetting in a simple optical system, and got a fairly complex integral. I was wondering if there's an easier way, or any book that ...
- 1,488
2
votes
3
answers
367
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mirror house gedanken experiment
Imagine a mirror house i.e. completely made of mirror with no traces of whatsoever light absorbent.
Now, you introduce a light beam into that room and observe somehow through a hole.
Would the room ...
- 2,853
3
votes
0
answers
111
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Optics: finding total power of a system, including wavelength
Specifically I need to create an ABCD matrix given 2 radii of curvatures, the thickness of the lens, type of glass (BK7) and a given wavelength. I will have to figure this out eventually, so help ...
- 31
1
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1
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744
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Plenoptic camera and display
This is a two part question about the technology described here:
Lytro's light field camera lets you choose focus later
I'd love to get an explanation of the technology.
What is the possibility/...
- 121
5
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2
answers
12k
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How to find the principal point in an image?
I need to find the principal point in an image. Its a point where the principal axis intersects the image sensor.
Due to misalignment this point is not at the center of image always(or image sensor). ...
- 460
5
votes
2
answers
577
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How to place a mirror parallel to a wall?
For one of my experimental setup I need to place a mirror perfectly parallel to a wall. It can be placed at any distance from the wall. I would like to use any method other than direct measurement. I ...
- 460
2
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3
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1k
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Virtual images in (plane) mirrors?
The following image is taken from teaching physics lecture Was man aus virtuellen Bildern lernen kann (in German):
Now the cited paper claims that the left hand side is the correct picture to explain ...
- 2,125
7
votes
5
answers
841
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Trapping a lightray
Given a solid whose interior is a hollow sphere with perfectly reflecting mirrors. A small hole is drilled in the sphere and a photon is sent in at some angle. Will it always eventually exit through ...
- 5,220
3
votes
1
answer
530
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Which lens parameters determines it's format?
I'm working with a megapixel sensor with a 1/2" format. I would like to know which parameters have to be taken into account in order to design a lens that can be fit with 1/2" format.
The light ...
- 193
0
votes
3
answers
2k
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Can reading glasses improve one's eyesight of objects lying in the long range?
Someone told me that reading glasses (a priori with a magnifying glass effect only) improve one's eyesight of objects lying in the long range distance. I am really sceptic about it since everything is ...
- 497
5
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14k
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Why should optical fibers be thin?
What are the reasons that optical fibers have to be thin (small radius of the fiber)? Is there a good picture which explains this in detail?
- 2,125
7
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2
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2k
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Do all light rays from a point passing through a thin lens converge at the image?
I have often seen diagrams, like this one on Wikipedia for a thin convex lens that show three lines from a point on the object converging at the image. Do all the other lines from that point on the ...
- 2,784
8
votes
2
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19k
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Why do things that are far away seem smaller?
As you see things that are far smaller, a funny question about this:
Imagine there are many people in a row (all are same height)
...
Hernan Eche
44
votes
4
answers
277k
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Virtual vs Real image
I'm doing magnification and lens in class currently, and I really don't get why virtual and real images are called what they are.
A virtual image occurs the object is less than the focal length of ...
- 6,927