Please respond all this questions

Experiment 12: Focal Length and Magnification of a Thin Model No. OS-8515C Table 12.1: Image and Object Distances Distance from light source to screen di 1/do 1/dj Image Size Objec 8%. 5 CM 100 cm 11:5 cm 0. 0113 cm Q - 0969 er 0.5em ucm 13 CM 45 cm 0. 07 6 9 cm 0 . 0272 cm| 14 cm 90 cm 78 cm 12 cm 10. 0128 cm /0 . 0833 cm 11. 7 cm 78 - ucm 0 . 0 8 85 5 0 . 0127 em 80 cm 67.8 cm | 12: 2 0m 0 . 014 7 cBo . 0819 am 12 em 68 cm 10. 0833 cm 0 . 01 4721 70 cm 57- 5 cm 12- 5 cm/0 . 0174 emb . 0 8 cm 12.4 cr 57- 6 cm |0 . 0806 er 0. 0174 in 60 cm 13 cm 10- 213 cm 10. 0769 cm 12.8 cm/ 47 . 2 cm|0. 0781 cm/0-U212 CM 50 cm 36. 5 cm/ 14.5 em 6. 0274 em 0.0689 composesmall bull. 14 36 cm 10 . 0714 cm/ 0 . 0279 en 3. For each intercept, calculate a value of f and record it in Table 12.2. 4. Find the percent difference between these two values of f and record them in Table 12.2. 5. Average these two values of f. Find the percent difference between this average and the focal length that you found in Part I. Record these data in Table 12.2. Table 12.2: Focal Length f Result from x-intercept Result from y-intercept % difference between results from intercepts Average of results from intercepts Result from Part I % difference between Average of results from intercepts and result from Part