All Questions
Tagged with refraction lenses
135
questions
3
votes
2
answers
887
views
Can we see a real image with naked eyes? [duplicate]
If we can't see a real inverted image without the help of a screen, why are we able to see an inverted image on the concave side of a spoon and in the convex lens when the object is far from the focal ...
- 33
0
votes
1
answer
35
views
The change of focal distance as a result of adding a substance [closed]
I have a given focal distance between lens and an image sensor (in air). Now I add a protective glass with a known refractive index and width between the lens and the sensor. How can I calculate the ...
- 11
0
votes
1
answer
797
views
Calculated focus of an asymmetric bi-convex lens
So I've been working on modeling an optical system using ray tracing. I've finally gotten to the point where I am testing things however I've come across something I'm not entirely sure of. I'm ...
- 203
-2
votes
1
answer
1k
views
(7) Will a nearsighted person who wears corrective lenses in her glasses be able to see clearly underwater when wearing those glasses? [closed]
Will a nearsighted person who wears corrective lenses in her glasses be able to see clearly underwater when wearing those glasses?
0
votes
0
answers
446
views
Raytracing on convex spherical surface, where n1>n2
I'm reading my textbook and I'm trying to figure the ray tracing of a single point of this one case that the book doesn't cover. My question is, what does the ray tracing look like when we have a ...
- 13
1
vote
2
answers
808
views
Does phase change occurs on refraction at a lens?
There is no phase change between refracted (transmitted) rays and incident rays, according to boundary conditions of electric field and magnetic field, in accordance with the Maxwell's equations and ...
- 1,088
0
votes
0
answers
307
views
The ideal shape of a plano-convex lens
What's the type of the ideal shape of a surface of a plano-convex lens to focus a parallel beam at the point? Considering the lens turned its flat side to a beam.
Surely it must be aspheric: ...
- 113
2
votes
1
answer
2k
views
Which of these 2 methods for calculating the focal length of a concave mirror is more accurate?
I have done an experiment to measure $f$ the focal length of a concave mirror.
I have a list of 8 values for $u$ the object distance and 8 values for $v$ the corresponding image distance.
I ...
- 1,329
1
vote
1
answer
1k
views
How is the image distance negative?
Following is a problem from book:
"The near point of a person's eye is 53.0 cm. To see objects clearly at a distance of 24.0 cm, what should be the focal length of the appropriate corrective lens?"
...
- 33
5
votes
3
answers
1k
views
Why do lens (convex) not introduce any path difference to light incident on it?
My understanding is that the top rays spend less time inside the lens where the speed of light is slow and the middle rays spend more time inside the lens so the time is kind of compensated . But I'm ...
- 153
0
votes
3
answers
2k
views
Dependence of lens power on the refractive index of the medium
How does the power of a lens depend on the refractive index of the surrounding medium?
- 39
5
votes
3
answers
614
views
Light hitting a GRIN (Gradient-index) lens at the optical angle
In the image below, rays of light are hitting the GRIN (Gradient-index) lens at the optical angle and then converge towards the optical axis. Why do they do this? The refractive index is only a ...
- 53
1
vote
0
answers
40
views
working to understand virtual images
I'm starting to understand how to use lenses a bit more, but I'm still pretty lost.
I'm building a project that's extremely similar to this one with the implementation. I think my biggest challenge ...
- 111
2
votes
2
answers
148
views
image formation by lenses
Why is the image formed by an object as described in the picture can be derived only from these three ray of lights?Every point on the object has multiple ray of lights going in every direction, how ...
- 85
0
votes
1
answer
1k
views
What will happen if the refractive index of lens is less than unity? [duplicate]
Generally the refractive index of any lens is greater than air. My question is what will happen if the refractive index of lens is less than unity?
- 39