Physics

Problem

Three experimental trials yield the following object and image distances for the same thin lens: • Trial 1:

s_o = 60\,\text{cm}

s_i = 40\,\text{cm}

• Trial 2:

s_o = 75\,\text{cm}

s_i = 37.5\,\text{cm}

• Trial 3:

s_o = 90\,\text{cm}

s_i = 36\,\text{cm}

Based on these data, which set gives the best estimate of the lens’s focal length and the percent difference from the accepted value

25.0\,\text{cm}

? a)

25.2\,\text{cm};\;0.8\%

24.9\,\text{cm};\;0.4\%

25.0\,\text{cm};\;0\%

24.6\,\text{cm};\;1.6\%