Question

Find the focal length (10 times) using the equation; 1/p+1/q = 1/f (f = focal length, p = object distance, q = image distance). Find the average value of the focal length. Use a ray diagram to illustrate this. Please write answer as large and neatly as possible, detailing all steps.

Data set

Position of mirror (cm)	Position of Screen (cm)
52.3	8.9
59.1	19.5
61.1	22.0
63.1	25.0
65.4	28.0
67.6	31.0
69.9	34.0
73.9	39.0
76.5	42.0
78.7	45.0

Answer 1