1 Chills and Tingling fingers and Skin symptoms (4 causes) 2  Chills and Tingling fingers and Temperature symptoms (4 causes) 3  Chills and Tingling fingers and Body symptoms (3 causes) 4  Chills and Tingling fingers and Leg symptoms (3 causes)  Chills and Tingling fingers and Limb symptoms (3 causes)
From the geometry of the spherical mirror, note that the focal length is half the radius of curvature: As in the case of lenses, the cartesian sign convention is used here, and that is the origin of the negative sign above. The radius r for a concave mirror is a negative quantity (going left from the surface), and this gives a positive focal length, implying convergence.
A. Focal Length. 1  Describe your data collection techniques for measuring the focal length of the short-focal-length converging lens using a distant object. 2  Insert an image of your setup. 3  The positions of both the lens and the viewing screen: xlens =. xscreen 4  =. Determine the measured focal length from the difference, f = |xscreen â xlens| =.