Recent content by Mark1991

Hi! Why is a in F=m*a equal to a =(d^2 x) / (d t )^2 and not to (d x)^2 / (d t )^2 Mark

It seems you used the same way of solution: Obviously, there does not arise a real image after the first lens, but after the second. But I think that there is an image after the third lens, too. After the fourth lens only a virtual image arises, and so on. Mark

Why do you think that two lenses will be enough? Which geometrical approch do you mean? If two lenses will be enough, where is the mistake in my consideration? Mark

No opinions?

Ok, another try: http://img198.imageshack.us/img198/4567/unbenanntbfy.jpg I was of the opinion that you should draw a ray that goes straight to the image as it would if the mirror were only a glass plane. So there are in fact two solutions: The solution with a ray that hits the mirror...

Hi! The diagram below shows two mirrors X and Y, and a solid object with white spots at P and Q. http://img199.imageshack.us/img199/9284/unbenanntcwz.jpg An observer at A sees an image of P reflected in mirror Y. Mark R, the position of this image, and draw a ray from P to the...

Good afternoon, I want to check another problem about optical physics: There are taken N equal converging lens, ordered one by one in a distance of f, where f is the focal distance. There is an object standing in a distance of 0,5*f of the first lens. A Sketch...

Yes, I know thar the theory of special relativity is based on this postulates. By the way: Why we kann be really, really sure that laws of relativity must work in every inertial frame? Only the fact nobody ever has observed an inertial frame, in which laws of physics does not work, does not...

Why do you think my solution is wrong? Which equation do you mean?

Okay, maybe another question: All opportunities to derive time-dillation has to do something with light. Even in your derivation you use a light beam, bouncing between two mirrors. Assume you take a ball which bounce between two walls with the velocity 0,5 c. The distance between the walls is...

Mh, ok. Thank you very much.

Thank you, Cyosis. Nevertheless I think my problem did not become clear. I will try it again with another experiment:Assume that there are two clocks on the train. A real clock and a fake-clock. The fake-clock ist not a real clock, because it can find out, whether the train is moved (relative to...

Thank you for your replies. Why they do not agree? Because special relativity tells us? No, we are not allowed to use the predictions of special relativity as long as we are not sure that the theory is true. (And we want to proof time-dillation with this experiment)...

Yes, I know. But my problem is to find the reason why special relativity is always true and not only when light-clocks are used.

I meant that the ways seems to be bigger for an external observer. When the clock is moved, the ways seems to become bigger, while speed of light remain constant. Hence an external observer follows that time goes faster. Mark