All Questions
Tagged with reflection geometric-optics
251
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How to determine if an observer can see an object with multiple mirrors?
How do I determine if an observer can see an object with multiple mirrors? I came across this image online and I am wondering if the observer (point O) see the object (point A)
My attempt:
I tried ...
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How does the mirror know what’s behind the paper?
I found this on social media. Although it was posted for fun, this is a valid question: How does the mirror know what’s behind the paper?
Show me how light reflected from the egg reaches the mirror.
- 5,054
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Why total reflection happens at only 1 angle?
The critical angle can be intuitively understood by Snell's law.If the incident medium has a bigger diffraction index than the refracted medium then according to Snell's law the refracted ray will be ...
- 101
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How do parallel reflected rays meet to form image at infinity? If they never meet then how is image formed?
In my textbooks it is written that when an object is kept at focus, its image is formed at infinity and is real. But how is this possible because parallel lines never meet and it is necessary for rays ...
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Is there a way to calculate the angle between the refracted and reflected rays given the refractive index?
Is there a way to calculate the refracted and reflected rays? I know we use Snell's law to calculate the refracted rays, but is there a formula to calculate the angle of the reflected rays, or does it ...
- 187
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Can a real object also be considered as a real image if the direction of rays were to be reversed?
I came across the concept in a book wherein a real object is classified as a body that emits diverging beams of light; whereas the virtual objects are a point or a collection of point where the light ...
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Finding the limiting refractive index of a rainbow
Give the limiting refractive index of a rainbow.
The raindrops are modelled as spherical droplets, with refractive index $n$, with parallel rays from the Sun incident on it. I have a very limited ...
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Object and Image Distance from Image height, Object height, and focal length [closed]
Is there a way to find the object and image distances from the object height, image height, and focal length? I understand that the magnification is equal to $-\frac{d_i}{d_o}$ or $\frac{h_i}{h_o}$, ...
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2
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201
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Lenses and missing reflection
I am wondering why reflected rays are not considered with lenses. If a ray strikes a surface, another is reflected off that striking point; however, this is not added when studying lenses, only ...
- 23
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Final image formation in these 2 cases:
Can someone please explain simply how we determine how many times we have to consider reflection and refraction to obtain final image.
Example a:
Here they only considered refraction twice to obtain ...
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85
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Keplerian telescope with parabolic mirrors
Is it possible to arrange two off axis parabolic mirrors (OPAs) to transform the emitted rays of a point source into a collimated beam, as in the figure below?
That is, similar to a Keplerian ...
- 117
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59
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Using Fermat's principle to derive the Cartesian paraboloid
I am self-studying Optics by Pedrotti and I'm on the subject of geometric optics, specifically ideal Cartesian surfaces. These are reflecting or refracting surfaces that form perfect images. I was ...
- 260
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Can any mirror arrangement give an optical advantage?
I'm trying to see tiny movements in a membrane using a laser spot that shines on it, and looking at the reflected spot. I was wondering if it is possible for any plane mirror arrangement to give me ...
- 2,000
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Reflection from a spherical surface
I am self-studying Optics by Pedrotti and I'm stuck on the algebra for an example of spherical reflection.
We have a point source at O that reflects off a spherical surface and creates a virtual image ...
- 260
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Magnification of closely packed thin lenses, or of closely packed lens and mirror
I was taught how to calculate the equivalent foci in both the cases. And since the formulae resemble the simple mirror and lens maker formulae, teacher said that this system is behaving like a single ...
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