Physics: An argon laser (λ = 5.0×102nm) shines down a silica glass fiber-optic cable with index of refraction 1.46. what is the speed of the laser light, cf , in the cable? select one of the following: (a) 1.5 × 108 m s (b) 2.1 × 108 m s (c) 3.0 × 108 m s (d) 4.4 × 108 m

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An argon laser (λ = 5.0×102nm) shines down a silica

Imthiccasf

10.01.2022

The speed of the laser light in the cable, $c_f=2.1\times 10^8\ m/s$

Explanation:

It is given that,

Wavelength of Argon laser, $\lambda=5\times 10^2\ nm=5\times 10^{-7}\ m$

Refractive index, n = 1.46

Let c_f is the speed of the laser light in the cable. The speed of light in a medium is given by :

$c_f=\dfrac{c}{n}$

$c_f=\dfrac{3\times 10^8\ m/s}{1.46}$

$c_f=2.05\times 10^8\ m/s$

$c_f=2.1\times 10^8\ m/s$

So, the speed of the laser light is $2.1\times 10^8\ m/s$ . Hence, this is the required solution.

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