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Home » The speed of light in substance X is m/s and that in air is m/s. The refractive index of this substance will be:a) 2.4b) 0.4c) 4.2d) 3.75
The speed of light in substance X is 1.25\times {{10}^{8}}m/s and that in air is 3\times {{10}^{8}}m/s. The refractive index of this substance will be:
a) 2.4
b) 0.4
c) 4.2
d) 3.75
CBSE | Class 10 | Lakhmir Singh | Physics | Refraction of Light
The speed of light in substance X is 1.25\times {{10}^{8}}m/s and that in air is 3\times {{10}^{8}}m/s. The refractive index of this substance will be:
a) 2.4
b) 0.4
c) 4.2
d) 3.75

a) 2.4 is the right answer.

Refractive Index: Speed of light in air/Speed of light in substance

\frac{3\times 10^8}{1.25\times 10^8}=2.4

i

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