All Questions
103
questions
2
votes
1
answer
113
views
Question on Babinet's principle example
Say we have the following mask (I drew it myself on paint):
I asked myself if it is possible to know the form of the image generated on a screen after the mask or know the electric field generated ...
- 75
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 ...
1
vote
3
answers
213
views
Diffraction grating from reflection
We had an experiment in our physics lab where we used two grating materials one with 2500 lpi(say A) and the other with 15000lpi(say B).
Now when we shine white light on both of them we didn't get any ...
- 8,230
2
votes
4
answers
86
views
Diffraction proof
I am talking about the way we generally explain the occurence of bright and dark fringes during diffraction. When we want to show a dark fringe we consider a pair of secondary light sources who have a ...
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
3
answers
166
views
Interference in single slit
In my point of understanding, interference is produced when waves from two sources of light (may be coherent or non-coherent) overlap resulting in consecutive bright and dark fringes on a screen. But, ...
- 65
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
1
answer
100
views
Double slit diffraction integral?
In our physics class, the professor went over a so-called "diffraction integral" for single slit diffraction:
$$E = E_0\cos(kx - kct)\qquad\text{then we ignore time dependence}:$$
$$E = E_0\...
- 187
0
votes
0
answers
119
views
Minimum intensity fringes are not perfectly dark in diffraction pattern?
I am studying Interference and Diffraction and everywhere I look it is written that "In an interference pattern,the minima are usually perfectly dark while in a diffraction pattern they are not ...
0
votes
0
answers
31
views
Equating scalar summation of electric field to electric field at maxima in single slit diffraction
I was going through the standard derivation of intensity distribution in case of single slit diffraction
I don't understand why we equate the scalar summation of electric field phasors(or the length ...
- 5
1
vote
1
answer
69
views
Is the lens image, a combination of diffraction patterns?
As I was reading through Luigi Picasso's Lectures in QM, I came across this paragraph where he explains the reason behind the resolution power of the optical instruments. He writes:
Let us now ...
- 11
0
votes
0
answers
96
views
Diffence between the double slit experiment, single slit diffraction vs the hair strand diffraction experiment
We know that in the double slit experiment the BRIGHT spots are created for path difference of $n\lambda$.However the condition is reversed in the case of diffraction. Here we see BRIGHT spots when ...
- 123
-1
votes
1
answer
89
views
Are hydrogen lamps coherent?
Those hydrogen or mercury tubes should not be coherent, but when looking at them through a grating without using a small aperture in front of the tube, you still see the discrete lines. Or just any ...
- 313
0
votes
1
answer
857
views
In single slit diffraction, why does the minima occur at integer multiples of lambda, which is contrary to double slit?
Single slit diffraction is also a kind of interference, so why does the minima do not occur at a path difference with half the wavelength, but occur at integer multiples? In my lecture notes, it says ...
- 73
0
votes
1
answer
302
views
Imaging a diffraction grating as it passes through a lens' focal point
I am trying to understand the image created when a coherent light source is incident on a diffraction grating as it is swept through the focal point of a lens. The situation is illustrated in the ...
