If refractive index of glass is 1.65, What is the speed of light in glass?

Given Refractive index = n = 1.65
            speed of light in vaccum = 3*10⁸ m s^-1

Using,Refractive Index= speed of light in vaccum/ speed of light in glass

1.65 = 3*10⁸ ms^-1 / speed of light in glass
speed of light in glass = 3*10⁸ /1.65
                                         =  1.8*10⁸ m s^-1

Therefore speed of light in glass is 1.8 *10⁸ ms^-1

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