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

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