Thanks for your precision @ikchris.
You are correct that the speed of an electromagnetic wave in different mediums is not the same.
In general when we refer to the speed of light, we refer to the speed of light in a vacuum which is constant.
I believe physicists prefer to use the term "universal speed limit" c to describe this constant.
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Oooo, you have cleared my understanding
Thanks
Please can I get in contact with you
My email is [email protected]