Optical Fiber

Q. If ${\epsilon }_0$ and ${\mu }_0$ are the electric permittivity and magnetic permeability in a free space, $\epsilon$ and $\mu$ are the corresponding quantities in a medium, the index of refraction of the medium is,

1. $\sqrt{\frac{{\epsilon }_0{\mu }_0}{\epsilon \mu }}$
   
2. $\sqrt{\frac{{\epsilon }_0\mu }{\epsilon {\mu }_0}}$
3. $\sqrt{\frac{\epsilon }{{\epsilon }_0}}$
4. $\sqrt{\frac{\epsilon \mu }{{\epsilon }_0{\mu }_0}}$

Q. The attenuation in optical fiber is mainly due to

1. Absorption
2. Scattering
3. Neither absorption nor scattering
4. Both (a) and (b)

Q. A string of length l=10 cm is fixed at one end and free at other.The maximum possible wavelength that can be generated in the string is

Q. Which of the following is a possible application of fibre optics?

1. All of above
2. High speed internet
3. Radio, TV and Telephone signal
4. Endoscopy