The inside of a computer is as dumb as hell but it goes like mad!

Thus we can get the correct answer for the probability of partial reflection by imagining (falsely) that all reflection comes from only the front and back surfaces. In this intuitively easy analysis, the 'front surface' and 'back surface' arrows are mathematical constructions that give us the right answer, whereas .... a more accurate representation of what is really going on: partial reflection is the scattering of light by electrons inside the glass.

The truth always turns out to be simpler than you thought.

Few people realize the number of things that are possible.

If the professors of English will complain to me that the students who come to the universities, after all those years of study, still cannot spell 'friend,' I say to them that something's the matter with the way you spell friend.

Physicists like to think that all you have to do is say, these are the conditions, now what happens next?

What is not surrounded by uncertainty cannot be the truth.