Question

plz only find (c) part

Answer 1

let c be the speed of light in air and v the speed of light in glass .$\mu _{glass} = \frac{c}{v} \\ \frac{3}{2} = \frac{c}{2 \times {10}^{8} } \\ c = 3 \times {10}^{8} \: \frac{m}{s}$
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Answer 2

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