Set up the light source so that it is plugged in and lying down on the table (not on the bench), with the 5-line pattern selected so that it projects five beams of light. Place the cylindrical convex lens, standing up on the table, in front of it so that the middle beam goes right through the center of the lens (the beams should be perpendicular to the length of the flattened lens). Which beams are deviated? Which beams are not deviated? The five beams (simulating a very distant light source - see what happens in the thin lens equation if the object distance goes to infinity) should meet at the focus. The distance from the focus to the center of the lens is the focal length f. What is the focal length of this lens? Repeat the above, this time for the cylindrical concave lens. Which beams are deviated? Which beams are not deviated. Repeat again, this time for the cylindrical concave mirror. Which beams are deviated? Which beams are not deviated? Noting the point where the light rays converge from the mirror and measuring to from the appropriate spot, what is the focal length of this mirror, again using the approximation that the object distance is infinite (because the incoming light rays are parallel)? What is its radius? Please help me questions that are in Bold letters.