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4 November, 19:35

Light traveling in water (n=1.33) moves with what speed? (a) 1.5 x 10^8 m/s (b) 2.26 x 10^8 m/s (c) 3 x 10^8 m/s (d) 3.99 x 10^8 m/s

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  1. 4 November, 22:44
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    b) 2.26*10^8 m/s

    Explanation:

    let n be the refractive index, v be the speed of light in water.

    then, the refractive index is given by:

    n = c/v

    v = c/n

    = (3*10^8) / (1.33)

    = 2.26*10^8 m/s

    Therefore, the speed of light in water is moving with a speed of 2.26*10^8 m/s.
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