1/10/2024 0 Comments Half life blue shift focal pointThe above diagram shows the behavior of two incident rays approaching parallel to the principal axis. Since the light ray is passing from a medium in which it travels slow (more optically dense) to a medium in which it travels fast (less optically dense), it will bend away from the normal line this is the SFA principle of refraction. At this boundary, each ray of light will refract away from the normal to the surface. Once the light ray refracts across the boundary and enters the lens, it travels in a straight line until it reaches the back face of the lens. This is shown for two incident rays on the diagram below. Since the light ray is passing from a medium in which it travels fast (less optically dense) into a medium in which it travels relatively slow (more optically dense), it will bend towards the normal line. At this boundary, the light ray is passing from air into a more dense medium (usually plastic or glass). Upon reaching the front face of the lens, each ray of light will refract towards the normal to the surface. Suppose that several rays of light approach the lens and suppose that these rays of light are traveling parallel to the principal axis. Before we approach the topic of image formation, we will investigate the refractive ability of converging and diverging lenses.įirst lets consider a double convex lens. Because of the special geometric shape of a lens, the light rays are refracted such that they form images. ![]() The net effect of the refraction of light at these two boundaries is that the light ray has changed directions. As a ray of light enters a lens, it is refracted and as the same ray of light exits the lens, it is refracted again. Lenses serve to refract light at each boundary. We have already learned that a lens is a carefully ground or molded piece of transparent material that refracts light rays in such a way as to form an image.
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