Unit-4. LASER and Fiber Optics (CO-4)

Part A: Give answers in short. (1 or 2 marks)

  • (1) Write Snell's law.

  • (2) Write full form of LASER.

  • (3) What is monochromatic light and polychromatic light?

  • (4) Write properties of laser light.

  • (5) Define: Absolute refractive index, Critical angle.

Part B: Write answers in Detail. (2 or 3 marks)

  • (1) Explain refraction of light with figure and examples.

  • (2) Explain refractive index. What is absolute refractive index?

  • (3) Explain total internal reflection in detail with figure.

  • (4) Give difference between common light and laser light.

  • (5) Write at least 6 application of laser light in various fields in detail.

  • (6) Describe types of optical fiber in detail.

  • (7) Write applications of optical fiber in various fields in detail.

  • (8) Explain construction of optical fiber with figure.

  • (9) Describe advantages of optical fiber over coaxial cable.

Part C: Numericals (3 marks)

  • (1) Velocity of light in air is 3 × 10 8 m/s and in liquid 1.8 × 10 8 m/s, so find out refractive index of liquid.

  • (2) Velocity of light in air is 3 × 10 8 m/s and in glass 2 × 10 10 m/s, so find out refractive index of glass.

  • (3) light enters in glass medium from air. Glass has refractive index is 1.56. So find velocity of light in glass.

  • (4) one optical fiber has value of refractive indices are 1.563 and 1.498, respectively. Calculate acceptance angle of optical fiber.

  • (5) An optical fiber has value of refractive indices are 1.48 and 1.45, respectively. Calculate acceptance angle and numerical aperture of optical fiber.