A fiber has a core made of dense flint glass and the cladding material made of crown glass. Calculate the following: (core made of dense flint glass 1.6555, cladding material made of crown 1.5243)

n1 = 1.5243, n2 = 1.6555

6. SNELL'S LAW i) Refraction is the bending of light as it passes from one transparent medium into another ii) Snell's Law relates the incident and refracted angles and predicts that the light will bend toward the normal when it enters an optically denser material. ni sin (81) nsin(2) relative critical ni - index of refraction for the core n2-index of refraction for the cladding material 01- angle of incidence 62- angle of refraction Ocritical - critical angle for total internal reflection iii) A light ray will be totally internal reflected if the angle of incidence is larger than or equal to the critical angle Case of total internal reflection citica iv) The normal is a line perpendicular to the interface between the media. Example :3 If a light ray is traveling from ice to air at what critical angle is needed for the light to propagate under the sheet of ice