0 Members and 1 Guest are viewing this topic.
And in this article, no mention of diffraction is found.
Quote from: hamdani yusuf on 20/05/2022 15:14:27This article shows the difference between Reflection,-Refraction,-and-Diffraction.Why did you post it?
This article shows the difference between Reflection,-Refraction,-and-Diffraction.
Quote from: Bored chemist on 20/05/2022 16:49:03Quote from: hamdani yusuf on 20/05/2022 15:14:27This article shows the difference between Reflection,-Refraction,-and-Diffraction.Why did you post it?To remind you that not every kind of wave spreading is called diffraction.
How did you come to the mistaken conclusion that I had said, or even thought, that it was?
Quote from: hamdani yusuf on 19/05/2022 12:44:21Why do you call it diffraction?It was called diffraction before I was born.Quote from: hamdani yusuf on 19/05/2022 12:44:21How much is the divergence caused by diffraction, It depends.
Why do you call it diffraction?
How much is the divergence caused by diffraction,
All light beams are (eventually) divergent- because of diffraction.
The spread is determined both by the mirror and by how narrow the beam is.If you make the beam narrow enough it will result in more spreading than the mirror.
https://en.wikipedia.org/wiki/DiffractionDiffraction refers to various phenomena that occur when a wave encounters an obstacle or opening. It is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660.
But you are the first one I know to confuse between diffraction and curved mirror reflection.
But you need to remember that d here is the width of the slit, not the width of the light beam itself. In my example above, the width of the incoming slit is much wider than the width of the light beam. The light beam doesn't interact with the edges of the slit.
Quote from: hamdani yusuf on 23/05/2022 14:27:39 But you are the first one I know to confuse between diffraction and curved mirror reflection.THE ONLY ONE WHO IS CONFUSED IS YOU.
Quote from: hamdani yusuf on 20/03/2022 10:09:21Quote from: Bored chemist on 20/03/2022 09:44:24It would be a math problem if the mirror was a polygon.Why does it stop being math problem when the number of sides of the polygon is increased toward infinity, i. e. becomes a circle? Because it stops working.If a beam of light hits a curved surface, it's no longer a beam.
Quote from: Bored chemist on 20/03/2022 09:44:24It would be a math problem if the mirror was a polygon.Why does it stop being math problem when the number of sides of the polygon is increased toward infinity, i. e. becomes a circle?
It would be a math problem if the mirror was a polygon.
Quote from: Bored chemist on 23/05/2022 17:55:29Quote from: hamdani yusuf on 23/05/2022 14:27:39 But you are the first one I know to confuse between diffraction and curved mirror reflection.THE ONLY ONE WHO IS CONFUSED IS YOU.Somehow you think that flat mirrors don't have the problem.Quote from: Bored chemist on 20/03/2022 10:14:32Quote from: hamdani yusuf on 20/03/2022 10:09:21Quote from: Bored chemist on 20/03/2022 09:44:24It would be a math problem if the mirror was a polygon.Why does it stop being math problem when the number of sides of the polygon is increased toward infinity, i. e. becomes a circle? Because it stops working.If a beam of light hits a curved surface, it's no longer a beam.
I started off by pointing out the most obvious reason that you are wrong.
perfectly flat mirror exactly 1 cm in diameter
while at the same time ignoring diffraction for flat mirror.
Imagine a beam of visible light from a distant star comes in through my large open window and hits a perfectly flat mirror exactly 1 cm in diameter and is reflected to form a circular spot of light on a screen at a distance of 1 metre.How big is the spot of light?Is it(1) smaller than 1cm(2) exactly 1 cm(3) bigger than 1cm?
I'm not sure if you refer to mathematical abstractions or real physical model.
Imagine...
was to get you to realise that diffraction also applies to flat mirrors.
If the beam has a finite width (and diffraction means it will have) them you need to consider the "focussing" effect of the curved mirror.Essentially the light will be scattered in every direction.Incidentally, unless the mirror has infinite mass, the wavelength will also be scrambled.
There is no angle using a circle, the light remains linear.
Your last sentence above is especially suspicious.
Then why did you write this?
Quote from: hamdani yusuf on 27/05/2022 14:52:23Your last sentence above is especially suspicious.Did it lead you to suspect that I know more than you?If someone who makes a living as a scientist says something about science, it is worth considering that it is correct, rather than assuming that it isn't.
Incidentally, unless the mirror has infinite mass, the wavelength will also be scrambled.