LAB #10: Lenses and Spherical Mirrors Theory: • • • • • What are lenses? What is difference between converging and diverging lenses? Lens equation. Sign convention. What is spherical mirror? Spherical mirror equation and sign convention. Experiment: LENSES fmeas. 1. For both lenses A and C find fmeas by focusing the room light on the table and measuring the distance from the table to the lens. Use estimated error. fcalc 2. Set up optical bench as in Figure 10.4. Move lens until image is in focus. Record object, lens and image position. Calculate O and I and f using eq.10.1. Repeat procedure for other lens. • Compare fmeas with fcalc MIRRORS Rcalc 1. Set up optical bench as in Figure 10.5 (object is the bulb). Move screen until image is in focus. Record object, mirror and image position. Calculate O and I and Rcalc using eq. 10.2. Rknown 2. Calculate Rknown T-glass plate thickness t-mirror thickness X-thickness of “mirror on plate” H=X-T-t • Mesure T, t and X using caliper • Calculate h±δh • Calculate Rknown±δRknown • Compare Rcalc with Rknown Note: δ ( A δX ) = A 2 where A is constant X X