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In what substance in Table 25.1 is the speed of light $2.290 \times 10^{8} \mathrm{m} / \mathrm{s}$ ?

$n=1.310 .$ The material is most probably ice at $20^{\circ} \mathrm{C} .$

Physics 103

Chapter 25

Geometric Optics

Reflection and Refraction of Light

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the refractive index off material can be found by the speed of light in a vacuum. You have speed off light and medium We with speed off lighting directories and three times 10 to the power eight here. The given in a problem. We have a speed off light in the substance given is a 2.290 So there's a 2.290 times 10 to the power eight deriding three by this number. This is our it cancels out we have here, huh? 1.31 So 1.31 in the table. Eso 1.31 when we look in their table 25 point when we see the ice has got the ice 20 degrees, 20 degrees has got refractive index over 1.3 closer to 1.31 So end off the problem. Thank you for watching

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