Maxwell's Equations Nineteenth Century. Most Historians ignore it because they don't understand it Maxwell lived two days journey from Edinbourough. He met his wife in Aberdeen. In the 1830s Michael Faraday came along, his path in electricity and Magnetism was clear Maxwell expanded on Faraday's work. Maxwell theorized that light was simply a vibration along lines of force.
Light is a transverse Electromagnetic Wave.
The speed of light is equal to the root of The Magnetic Constant over the Electric Constant. The electric flux creates a new magnetic flux. Through an optically dense medium, light will not propagate as easily or not at all. We can't block gravity. Many loops on the secondary, few on the primary.