1) Which principle allows light to travel long distances in an optical fibre without escaping? a) Total internal reflection b) Diffraction c) Interference d) Dispersion 2) In optical fibre communication, the light ray reflects inside the fibre because.. a) Angle of incidence is less than critical angle b) Angle of incidence is greater than critical angle c) Fibre core has lower refractive index than cladding d) Light bends at random inside fibre 3) Which part of an optical fibre ensures that light undergoes total internal reflection? a)  Fibre jacket b) Outer protective layer c) Core–cladding boundary d) Air around the fibre 4) Optical fibres are widely used in communication systems because.. a) They absorb light effectively b) They transmit light signals with minimal loss c) They scatter light signals d) They block electromagnetic waves 5) Which condition is necessary for total internal reflection inside an optical fibre? a) n_core < n_cladding b) n_core > n_cladding c) n_core = n_cladding d) n_core unrelated to n_cladding 6) Optical fibres are preferred for medical endoscopy because they.. a) Reflect images without bending  b) Absorb X-rays effectively c) Produce interference patterns d) Refract light randomly 7) In optical communication, information is sent through fibres by converting.. a) Sound → Mechanical waves b) Electrical signals → Light signals ✅ c) Heat → Infrared rays d) Magnetic signals → Electrons 8) Which is NOT an application of total internal reflection? a) A) Periscopes b) B) Optical fibres c) C) Diamond sparkle d) D) Photoelectric effect ✅ 9) The main reason optical fibres are used for internet cables is.. a) High data carrying capacity b) They are cheap glass rods c) They increase resistance to signals d) They block unwanted frequencies 10) In fibre optic medical instruments, the property used to guide light to internal organs is.. a) Refraction in cladding b) Diffraction of visible light c) Absorption of X-rays   d) \Total internal reflection in fibre core

Explain how total internal reflection is used

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