ACTIVITY A: REFRACTION OF LIGHT Write the given, unknown, and complete solutions in answering the following problems. 1. As light travels from air to water, the angle of the refraction is 25.0\" to the normal, find the angle of incidence. 2. Light in air enters a diamond facet at 45.0\". What is the angle of refraction? 3. A ray of light in air has an angle of incidence of 30.0 on a block of unknown material and ab=n angle of refraction of 20.0\". What is the index of refraction of the material? 4. What is the speed of light in chloroform (n- 1.51 )? ACTIVITY B: PROBLEMS 0N REFRACTION Write the given, unknown, and complete solutions in answering the following problems. 1. A ray of light is incident through glass, with refractive index 1.52, on an interface separating glass and water with refractive index 1.32. What is the angle of refraction if the angle of incidence of the ray in glass is 25"? 2. What should be the angle of incidence of a light ray incident through air on the boundary separating air from water so that the angle of refraction is 30"? (refractive index of air is 1 and that of water is 1.32) 3. The speed of light in an unknown medium is measured to be 2.76 x 10"8 m/s. What is the index of refraction of the medium? 4. Optical fibres are generally composed of silica, with an index of refraction around 1.44. (a) How fast does light travel in a silica fibre, and (b) How long will it take for that light to travel from Geneva to Edinburgh, a distance of 1259km