Question

Solve the question in attachment :)

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Answer 1

Answer:

1.5x 108

Explanation:

2 =3x108/y

y=3x108/2

y=1.5x108

Answer 2

Answer:

1.5*$10^{8}$ m/s

Explanation:

We know that refractive index is inversely proportional to the speed of light that is if the refractive index of a medium increases then the speed of light in it will be less. Eg: Vaccum has refractive index as 1 which is less compared to diamond but the speed of light in vaccum > speed of light in diamond

Hence, we arrive at a formula, refractive index of a medium = speed of light in vaccum / speed of light in that medium

                                        (OR)

                                  $R_m$ =      $\frac{3*10^{8} }{S_{m} }$

Where  $R_{m}$ is refractive index of medium "m"

And $S_{m}$ is speed of light in medium "m"

Therefore, according to the question, 2 = 3*$10^{8}$/ Sm

Implies, $S_{m}$= 3*$10^{8}$/2 = 1.5*$10^{8}$ m/s