when light propagates through two adjacent materials that have different optical properties, some interesting phenomena occur at the interface separating the two materials. for example, consider a ray of light that travels from air into the water of a lake. as the ray strikes the air-water interface (the surface of the lake), it is partly reflected back into the air and partly refracted or transmitted into the water. this explains why on the surface of a lake sometimes you see the reflection of the surrounding landscape and other times the underwater vegetation. these effects on light propagation occur because light travels at different speeds depending on the medium. the index of refraction of a material, denoted by n, gives an indication of the speed of light in the material. it is defined as the ratio of the speed of light c in vacuum to the speed v in the material, or Part B What is the minimum value that the index of retraction can havo? ► View Available Hint(s) Figure 1 of 1 0 +1 incident ray reflected ray between 0 and 1 interface Submit refracted ray normal An example of reflection and refraction of light is shown in the figure. (Figure 1)An incident ray of light the interface with the lower material. The reflected ray travels back in the upper material, while the refr. material. Experimental studies have shown that the incident, reflected, and refracted rays and the norm plane. Moreover, the angle that the reflected ray makes with the normal to the interface, caled the ang inach har mase hetween the light ray and the normal to the inte
