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The speed of light will be minimum while passing through ?

/ Physics Mcqs / By
The speed of light will be minimum while passing through ?A. Vaccum
B. Glass
C. Water
D. Air

The speed of light will be minimum while passing through which of the following mediums? Notes: Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water and 200,000 kilometers per second in glass.