1What is an optical fibre? Name its layers and state the job of each.
2Why is the cladding made of a material of lower refractive index than the core?
3Explain how light travels from one end of a bent optical fibre to the other.
4What would happen to light inside a fibre if it struck the core-cladding boundary at an angle smaller than the critical angle?
5Why are optical fibres preferred to copper cables for telecommunication?
6Describe how a fibre internet cable is connected to a router in a home.
7How are optical fibre cables laid in Nepal, and how is Nepal connected to the international network?
8What is endoscopy? How is it used to find an ulcer in the stomach?
9Why does an endoscope contain two bundles of optical fibres?
10Write two differences between endoscopy and colonoscopy.
11What is keyhole surgery? Why is it also called laparoscopic surgery, and what is it used for?