It will be the second option i believe
6.43125...
To the nearest cent, I'm assuming they mean, 6.43, since there is no 5 or higher number in the thousandths place...
Answer:
The speed of light through the medium is 2.1 * 10^8 m/s
Step-by-step explanation:
In this question, we are asked to calculate the speed of light beam as it travels through a medium given the refractive index of the medium.
Mathematically;
n = c/v
where n is the refractive index, v is the speed of light through the medium and c is the speed of light in a vacuum.
From the question, we can identify that the refractive index is 1.46 and the speed of light through vacuum is 3 * 10^8 m/s
Rearranging the equation; we have;
v = c/n
v = (3 * 10^8)/1.46
v = 2.1 * 10^8 m/s
-10 degrees
Starting at 6 degrees
Knowing we'll end up negative
We subtract, minus, take away
10 degrees to get to -4
