# Questions tagged [geometric-optics]

The subfield of optics in which light propagation is approximated in terms of rays. It mainly includes reflection and refraction on surfaces.

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### Ideal lens surface to prevent spherical aberration

I've been writing a program to trace light rays through various surfaces. I have it simulating refraction and reflection (including total internal reflection) and out of curiosity I wanted to try ...
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### How to simulate the effectiveness of the designed light reflector structure? [closed]

I designed the reflector structure of the street light. The mathematical equation for the structure of the reflector is expressed in the form of a polynomial function. I'd like to simulate it to see ...
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### What is the right option for this question? I think its d but some sources on internet say its c but their explanation is not convincing enough [closed]

According to me, first, the incident rays parallel to principal axis on the convex mirror will meet at focus, so v is 30 cm. for concave mirror, u is -20 cm and by using the mirror formula, the value ...
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### Magnification of an object placed in water due to a concave mirror [closed]

Here is a question that appeared in my test: A concave mirror of focal length 15 cm is placed in water of refractive index $\mu = 3/2$. Water is filled upto 30 cm. An object of height 1 cm is placed ...
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### On the definition of ray (optics) and wavefront of light

Wikipedia defines a ray as "[...] a curve that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow". But the usual meaning of a ray in ...
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### I seek a highly specular reflective (>99%) surface for UVC (~253.7 nm) photons. Is such a surface possible?

Does the answer change with the angle of incidence? If specular reflectance changes with angle of incidence, what is the relationship between them? If such surfaces are possible, where can I find a ...
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### Plane mirror with focusing/accommodation Question

For plane mirrors, when considering accommodation (focusing system)-- do we account the distance twice? or just the distance that is reflected back to us ex. if a person is 10 cm away from a mirror -- ...
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### Mechanism: Instantaneously vary frequency of photons emitted, or passing, by, over a wide range of frequencies, with reliable consistent precision?

For an optical computing application, I need to set frequency of photons emitted or passing by a small mechanism, instantaneously, and it needs to be able to change this frequency from one instance to ...
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### On the optical properties of quadrupolar magnets

Here's the magnetic field produced by a quadrupole Citing from Barr, Giles; Devenish, Robin; Walczak, Roman; Weidberg, Tony Particle Physics in the LHC Era (Oxford Master Series in Physics) (p.55,56). ...
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### Image created by a parabolic mirror when the object is at the center of curvature

I am told that the image created by a parabolic mirror is the same size as the object when it is on the center of curvature, which is twice away from the focus of the parabola. I tried to prove this ...
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### Is the Jones matrix always $2 \times 2$?

I have only seen a $2\times2$ Jones matrix. It makes sense that it has such dimension but is there a Jones matrix different from this? perhaps a general form?
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### Range of accommodation in myopia

Here's what I understand about accommodation of the eye and correcting myopia with a diverging lens. (Source material) An ideal eye can accommodate and focus any object that is farther to the eye than ...
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### Why do some anti-reflective (or anti-glare) lenses use layers of materials with alternately very high and very low refractive indices?

Some specials lenses like this (or coatings on them) try to minimize the refractive index, or the change thereof, or at least make the change very gradual. But others apparently do the exact opposite, ...
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### Replace defocus on telescope with negative lens

I am wondering if you could estimate the strength of your glasses by the amount of defocus on your refractor. So below I have a keplerian telescope with 2 positive lenses. If it is in focus, you get ...
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1 vote
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### Could you please suggest physics textbooks that discuss object velocity and image velocity pertaining to spherical and plane mirrors?

I have seen texts such as Zemansky's University Physics or Halliday Resnick's Physics (fundamentals and the older edition) etc. do not contain discussions on object velocity, image velocity (and their ...
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### How we can distinguish objects separately, even if light rays from them are getting mixed up in space surrounding them?

I am a high school student and I am very confused in one thing in optics (ray optics) which I think is the most basic thing but didn't find any answer on internet, before I ask let me present one ...
1 vote
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### How to find the index of refraction of a glass cube with limited information?

This is a problem from my textbook that I've been struggling to solve: A ray of light from a laser pointer is incident on the "upper" surface of a glass cube at the angle of 70°. The ray ...
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### Difference between Myopic Eye and Normal Eye with ray diagrams

So I have a problem where i am getting confused what happens when an object is placed in front of a myopic eye. Also I have another problem ie. why the image becomes blurry if it is formed beyond the ...
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### How to determine aberrated wave front at exit pupil of a lens system using ray tracing?

I am working on building a very simple optical simulator for my workflow. I am stuck at a point where I am trying to simulate the impact of diffraction on a lens system that has geometric aberrations. ...
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1 vote
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### How does paint of two color mix to form one of new color?

Suppose I take bit from two paints of different color and I smudge both on the same spot on a piece of paper, I will get a new color. What exactly is the physics behind this?
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### Can a tall chain of mountains rise, apparently like the Sun, if watched from a plane approaching the mountains?

Assuming you are in a passenger plane that flies at 11000 meters having a speed of 1000 km/h, and pointing to a chain of mountains 5000 m tall, is it possible to see the chain rising from below the ...
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### How does viewing through two eyes give us a sense of depth?

With ONE ray, your eye can never determine where the object is. Note that in your diagram, the eye can deduce the line along which the apparent image is, but to make a point, we need two lines! Who ...
1 vote
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### Thin layer of air between lenses in contact

consider the following case for thin lenses Case 1: lens between two different medium applying refraction through curved surfaces two times and subtracting - \frac{\mu_{oil}}v - \frac{\mu_{air}}u = ...
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### What is the plane of a concave or convex mirror?

What is the plane of a concave or convex mirror? Is it along its principal axis or its area? I am convinced that the plane should be along the area of mirror but i am not sure about it. I tried to ...
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