It takes nd/ (lambda*f) time or a short pulse of light to travel from one end of the glass to the other.
If we talk about free space, that is, vacuum, light travels at a speed of 3x10^8 m/s, yet inside a glass light travels at a speed of v= c/n, where v is the velocity of the light and n is the refractive index. Now,
v=d/t,
so t= d/v
t= d/ (c/n)= n*d/c
c= lambda*f
t= nd/(lambda*f)
here, d is the thickness of the block, t is the time required and c refers to speed of light.
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Answer:
C. There was a bloody rebellion called the Mau Mau Revolt.
Explanation:
The book "A Long Walk To Water" explains this in detail.
Because the mud was rich and held strong since Mesopotamia was the "land between the rivers". The mud was from the banks of the yufrates and tigres river. (Check my spelling on the rivers)
