6- Use Fig. 23-37 CONCEPTUAL EXAMPLE 23–11 Half-blocked lens. What happens to the image of an object if the top half of a lens is covered by a piece of cardboard? Center line Object (a) Ray 1 leaves one point on object going parallel to the axis, then refracts through focal point behind the lens. F FIGURE 23-37 Finding the image by ray tracing for a converging lens. Rays are shown leaving one point on the object (an arrOW). Shown are the three most useful rays, leaving the tip of the object, for determining where the image of that point is formed. (Note that the focal points F and F' on either side of the lens are (b) Ray 2 passes through F in front of the lens; therefore it is parallel to the axis behind the lens. the same distance f from the center of the lens.) Object (c) Ray 3 passes straight through the center of the lens (assumed very thin). Image

6- Use Fig. 23-37 CONCEPTUAL EXAMPLE 23–11 Half-blocked lens. What happens to the image of an object if the top half of a lens is covered by a piece of cardboard? Center line Object (a) Ray 1 leaves one point on object going parallel to the axis, then refracts through focal point behind the lens. F FIGURE 23-37 Finding the image by ray tracing for a converging lens. Rays are shown leaving one point on the object (an arrOW). Shown are the three most useful rays, leaving the tip of the object, for determining where the image of that point is formed. (Note that the focal points F and F' on either side of the lens are (b) Ray 2 passes through F in front of the lens; therefore it is parallel to the axis behind the lens. the same distance f from the center of the lens.) Object (c) Ray 3 passes straight through the center of the lens (assumed very thin). Image