[填空题]
A student investigates the refraction of light. A light beam emitted from the ray box is incident on a transparent block. The ray trace sheet and the position of the ray box and the transparent block are shown below.
The distances a and b are measured. Then the measurement is repeated for different values for angle $θ$. 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. n =
(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.
