The first part of the experiment required one to trace the light rays going through a converging and diverging lenses. By setting up the light source towards the end of the paper and placing the lenses about 5 cm in front of the light the focal distances were found to be 14 cm for the converging lens and -5.5cm for the diverging lens. These focal distances theoretically make since because the converging lens causes the light rays to combine in front of the lens making it positive and the diverging lens causes the rays to spread apart after crossing through the lens making the focal point behind the lens and the focal length be negative. The incoming rays are the rays the light source sends through the lens and the transmitted rays are the ones that were passed through the lens. The next two parts on finding the focal lengths and magnifications required tables. For the first part on converging lenses the first thing found was the focal length, as described in the procedure, which was 188mm. The object height, diameter of the light source, was 40mm. After finding these and
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Illustrates the observed and calculated values used to determine the focal distance and magnifications of a converging lens. The same process was done for the concave mirror. The object height was the same since the light source was the same. The data was recorded the same as the previous section and an average focal length was found to be 100.09mm. This was then used to calculate a percent error based on the 100mm marked on the lens, there was only 0.09% error. The data was recorded in table 2 below.
O(mm) I(mm) h_i(mm) F(mm) M=h_i/h_o M=-i/o Percent Difference
250 170 26 101.19 0.65 -.68 4.5%
350 138 12 98.98 0.3 -.39 26.09%
Table 2. Illustrates the observed and calculated values used to determine the focal distance and magnifications of a concave
Illustrates the observed and calculated values used to determine the focal distance and magnifications of a converging lens. The same process was done for the concave mirror. The object height was the same since the light source was the same. The data was recorded the same as the previous section and an average focal length was found to be 100.09mm. This was then used to calculate a percent error based on the 100mm marked on the lens, there was only 0.09% error. The data was recorded in table 2 below.
O(mm) I(mm) h_i(mm) F(mm) M=h_i/h_o M=-i/o Percent Difference
250 170 26 101.19 0.65 -.68 4.5%
350 138 12 98.98 0.3 -.39 26.09%
Table 2. Illustrates the observed and calculated values used to determine the focal distance and magnifications of a concave