[填空题]
A student investigates the refractionfe/r-b tbdy3-.g* ui h ofi cg dc g::,0ydbu2jm- light. A light beam emitted from the ray box is incident on a transparent block. The dy0:j:ggiudmc2-,b c ray trace sheet and the position of the ray box and the transparent block are shown below.
1.The distances a and b are measured. Then the measurement is repeated for different values for angle $\theta$. The variation of b with a is plotted on the graph below according to obtained data.
Draw the line of best fit for the plotted data on the graph.
2.Theory suggests that
$n=\frac{a}{b}$
Where n is the refractive index of the material and has a constant value.
1.Suggest whether the data is consistent with the theoretical prediction.
2.By using the graph calculate n with its absolute uncertainty for the data point when a is measured to be 3.0cm.
3.The accepted value for the refractive index of the transparent block is 1.71. Comment on your result.
3.Suggest why using the line of best fit to find the value for n is better than finding
n from an individual data point.
参考答案: $1.7±0.2%$
本题详细解析:
A straight line passes through within the error bars ✓
