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why is light a vector quantity although it has both magnitude and direction?
Vector quantities are quantities that have size and direction. For example velocity has quantity speed and direction East or West, e.g. Electromagnetic fields also have size like 10 volts/m and direction east or north for example. Light is not a vector quantity, it has size the speed of light 300 mega meters/second but it does not have a direction. Another example is like saying I was driving home at 60 mph. The '60 mph' is a speed, but not a vector velocity because there is no direction specified.
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Ramesh
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