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23 July, 21:01

A plate glass window (n = 1.5) has a thickness of 4.5 mm. how long does it take light to pass perpendicularly through the plate?

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  1. 23 July, 21:10
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    The solution to this is to use the n = c / v equation

    Where:

    c is the speed of light: 3x10^8; and

    The idea that v = m/s

    So plug in the m/s for v in the n = c v equation and you will get:

    1.5 = (3 x 10 ^ 8) / ((4.5m) / s))

    Therefore, the time should be 2.25 x 10 ^ - 10 seconds.
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