To calculate how long it takes for the laser beam to pass through the glass window, you need to find the time it takes for light to travel through the thickness of the glass.
The speed of light in a medium is given by the equation:
v = c / n
where:
v = speed of light in the medium
c = speed of light in a vacuum (~3.00 x 10^8 m/s)
n = refractive index of the medium (in this case, glass)
First, let's calculate the speed of light in glass:
v = c / n
v = (3.00 x 10^8 m/s) / 1.46
v = 2.05 x 10^8 m/s
Next, we need to calculate the time it takes for the light to travel through the glass window.
distance = thickness of glass window = 0.125 m
time = distance / speed
time = 0.125 m / 2.05 x 10^8 m/s
time ≈ 6.10 x 10^-10 seconds
So, it takes approximately 6.10 x 10^-10 seconds for the laser beam to pass through the glass window.