To see an object, its light rays have to meet on the retina in the focal point. But the focal point is a small white dot. Basically nothing would be distinguishable and the retina would burn because all energy is concentrated at a single point? Obviously, this is not happening. But why?

As a student you are typically told that Maxwell's equations (ME) in vacuum are linear. However, it seems that for extremely high electromagnetic fields the equations for electromagnetism turn out to be nonlinear. I think examples are super-strong laser pulses (even if the precise mechanism is un...

I was reading this thread and I'm a bit confused. The answer says negative probabilities can account for destructive wave interference and the events cancelling out. But if events just cancel out, shouldn't that make the probability zero? Why would it be negative? Additionally, my (possibly in...

We measure an angle to be -55 degrees (2 sigfigs). Let us take the sine of this angle. We get sin(-55) (2 sigfigs). Now, since sin(-55)=sin(305), then we can also take the sin(305) (3sigfigs). Now, since sine(305) is just sin(3905), then we can also take sin(3905) (4sigfigs) and so on. In this ma...

I'm looking at this article from Scientific American: https://www.scientificamerican.com/article/star-wars-science-light-speed/#:~:text=Normal%20humans%20can%20withstand%20no,heavier%20blood%20to%20the%20brain. The third paragraph states that: "When undergoing an acceleration of 9 g's, your body ...

There are many posts on this forum asking whether motional emf is actually an instance of Faraday's Law -- because, confusingly, it is often taught as though it is, with no qualification. The best answer I've seen so far is this really excellent one by @Timaeus. But I would like to go one step ...