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Why does light change direction when it hits a surface with a different refractive index?

The path upon which light propagates is determined by Fermat's Principle. This says that light will always travel along the path of least time. Now, we often think of the speed of light as a constant, but th...
BG
Answered by Ben G. Physics tutor
2984 Views

What's the difference between a republic and a federation?

In short, there isn't one. If you look at forms of government as a sort of pyramid, at the top you'd have democracy and fascism etc (the big forms of governance), then in the middle you'd have republic, mona...
LJ
43155 Views

What is the Hardy-Weiberg principle? How do I use the calculations? What are the limitations?

The Hardy-Weinberg principle is used in population genetics. Population genetics is the study of allele frequencies in populations and how they change over time. There are 2 equation used in the Hardy-Weinbe...
JL
Answered by Jessica L. Biology tutor
3669 Views

How important was the French renaissance?

One could be drawn to saying that the French renaissance was the most important of all. While the Italian renaissance was one of the most aesthetic and the later German and Danish one was very philosophical,...
LJ
Answered by Louis J. French tutor
1813 Views

How important was Victor Hugo?

Victor Hugo is what the French like to call an " homme du siècle "-- a man of the century. He lived through nearly the entire 19th century and as well as experiencing two republics and two Napoleon...
LJ
Answered by Louis J. French tutor
1718 Views