All Questions
11
questions
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
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
1
vote
1
answer
483
views
Why do reflection gratings work?
The law of reflection (that the angles of incidence and reflection are equal) can be derived directly from Maxwell's equations, or from Fermat's principle. However, reflection gratings completely defy ...
- 1,307
1
vote
1
answer
176
views
Overcoming the critical angle of total internal reflection? [closed]
Incident light on an interface between an optically denser medium (refractive index $n_1$) and a less dense medium ($n_2$) will undergo total internal reflection (TIR) if the angle of incidence (AOI) ...
- 161
16
votes
4
answers
3k
views
Reverse of diffraction
Can we arrange a practical in such a way that the dark and bright bands in diffraction grating be allowed to pass through the same slit to get the original light (i.e the incident light before ...
3
votes
1
answer
211
views
Pink on LCD screens, how is it possible? [closed]
On the LCD screens a flash makes 2 strips of color, 2 strips of white light, and a rainbow colored strip. This latest has weirdly a pink color in it. How is it possible? The pink color is not part of ...
- 39
4
votes
1
answer
912
views
Explain Sun Glare
Above is a picture that I took just before the sun set. Notice the prominent red blob to the left of the sun. Can anyone explain the phenomenon that creates superimposed shapes and blobs in images of ...
- 161
1
vote
1
answer
731
views
Why light rays gets scattered when it enters a translucent window pane?
Consider the light source is the light post, outside the window of my house (Pic 1). When the rays from the light post enters through the window pane which is translucent gets scattered and forms a ...
- 1,273
1
vote
2
answers
1k
views
x-ray diffraction of crystals
In explaining x-ray diffraction of crystals, usually the approach is to consider the atoms absorb radiation and scatter it, at some angles constructive interference occur and bright spots can be ...
- 1,135
1
vote
2
answers
11k
views
Rainbow reflected on TV screen? (pic attached) [duplicate]
According to wikipedia,
A rainbow is an optical and meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets...
Given that we require ...
- 1,546
3
votes
1
answer
853
views
computing wavefront deviations for off-axis mirrors
Suppose you have two off-axis aligned mirrors which are nearly planar, with small deformations such that a wavefront at plane $P_I$ at distance $-D$ from the mirrors, is refocused at distance $D$ at ...
- 14.5k