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how to calculate light speed. Do your background research and then go cook some eggs and see what they can tell you about the speed of light. If you dont have the wavelength you can use the relationship.
Calculate distance or time. For this case the medium is a vacuum and is estimated to be 30 x 10 8 ms. It will even convert equivalent units like years to days light-years to parsecs or warp factors to multiples of c.
The refractive index of air for visible light is about 10003 so the speed of light in air is about 90 kms 56 mis slower than c.
When light passes through another object the light is slowed down. V f l. Speed of light is the speed at which light waves propagate through different mediums. Measuring the Speed of Light from Astronomical Observations.