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I'll assume that this is the critical angle from the median to a vaccum.
You use Snell's law, n1sin(x1) = n2sin(x2)
where n1 = index of refraction of your median, n2 = 1 (the index of refraction in a vaccum), x1 = the critical angle (45 degrees), x2 = 90 degrees since light comes out at 90 degrees when it is shone on the critical angle.
So...
n1sin(45 degrees) = 1 (sin 90 = 1)
n1 = 1/sin(45 degrees)
n1 = 1.414...
Now the index of refraction is the speed of light in a vaccum over the speed of light in the median so:
1.414... = (3.00 x 10^8 m/s) / v
v = (3.00 x 10^8 m/s) / 1.414...
v= 2.1 x 10^8 m/s
Wiki User
∙ 13y ago
The speed of light in a vacuum is approximately 299,792 kilometers per second, or about 186,282 miles per second. This constant speed is denoted by the letter "c" in physics equations.
Wiki User
∙ 14y agoThe speed of light is approximately 186,282.397 miles per second or 299792458 metre per second.
Wiki User
∙ 14y ago83,827.07865 miles per second.
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