All Questions
75
questions
2
votes
2
answers
102
views
Why do gaps in my blinds create multiple lines?
Multiple lines appear on my floor every morning from the gaps in my blinds.
Why does this happen and does it have to do with light being a wave, like in the double slit experiment? If so could it be ...
- 23
0
votes
1
answer
39
views
Pointing flash at LCD television creates a weird diffraction effect
I was looking around my room for something with my phone’s flash on, and noticed a very unique pattern reflecting off of the television.
FYI. The flash is white.
Any idea why it diffracts like that?
...
- 390
0
votes
1
answer
48
views
General questions on the "big picture" of scalar diffraction theory
When studying diffraction, my courses at university stopped with frauenhofer diffraction, which - as far as I understand it - describes the diffracted far field for diffraction of a more or less ...
- 23
0
votes
0
answers
25
views
Why in the experiment of double slits, in case of radiation of wavelength of red light, we can observe an envelop of the minimum?
I have made an experiment in which i have to measure the intensity of the light generated by an $\text{He-Ne}$ laser, in the case of two slits, I pretend to observe an interference lattice.
I have to ...
0
votes
2
answers
135
views
Why diffraction works at sharp edges?
While introducing Diffraction, physics textbooks say that this effect (Diffraction) is observed distinctively when the light is passed through a very small opening, the length or diameter of which is ...
- 2,517
0
votes
1
answer
83
views
How to explain interference pattern in our eye?
Suppose we got a Lamp L that emits some light. The light afterwards hits a diffraction Grating G at a distance a. Now if you were to look through the grating with your Eye E, you were to see the ...
- 462
0
votes
0
answers
72
views
Why does yellow light shining on the tv diffract all spectrum of light?
This was an image I took during the evening time on the led tv , I had two questions the first was why was the tv giving off a x pattern of the diffracted light which constitutes primary white light ...
- 648
1
vote
3
answers
250
views
In an optical system, does the Point Spread Function apply to all light? Or only Point light sources?
So in optics, the Point Spread Function (PSF) describes how an optical system responds to a point source of light. My understanding is that this is due to diffraction and the wave-like nature of ...
- 203
0
votes
2
answers
71
views
Stellate spikes around luminous objects
Why do bright objects feature a stellate around them (like in the lights on the bridges below)?
If this were due to scattering of light, I'd have expected it to be like a luminous sphere around rather ...
- 349
2
votes
1
answer
95
views
Can someone explain the Fresnel diffraction simply? [closed]
I have been researching and found multiple equations. There are ones for the Arago's spot, Fresnel number, Fresnel diffraction, Fresnel integral. They often lead to other wave behaviors which confuses ...
- 21
0
votes
0
answers
16
views
What unit should I use to measure the light intensity of aragos spot
I am trying to measure the relationship with the radius and its effect on the light intensity of Arago's spot. I plan to use a camera or a light meter but I am not sure what unit to use in my ...
- 21
1
vote
4
answers
513
views
What causes light passing through a hole to change direction?
On diagrams showing light passing through a hole, the wave of light appears to change direction when it emerges from the hole.
What causes that change of direction? Is it maybe the walls of the hole ...
- 826
8
votes
2
answers
660
views
Why does diffracted light in certain TVs get collimated in six straight or curved rays? [duplicate]
This evening, looking at the television in my apartment, I noticed that the light reflected on it manifested some kind of regular pattern. When the source of light is sufficiently far, this consists ...
- 81
0
votes
1
answer
350
views
Finding angles of second and third order minima given only angle of first order minimum
For the following problem we are asked to find the second and third order minimums of a single slit diffraction experiment at $13^{\circ}$. I tried using the following $$\theta_p=p\cdot\frac{\lambda}{...
- 101
3
votes
5
answers
2k
views
Why are shadows sharp close to the object, but blurry farther?
There are quite a few questions about blurry shadows and diffraction on this site, though, none of them specifically answer my question about why shadows blurriness is distance dependent, that is, why ...
- 29k