The student: draws line LN; labels the midpoint of LN with the letter M; draws a line PR parallel to LN and 10.0 cm below it. On Fig. 1.1, draw a normal to LN at the point M. Carry the normal downward until it meets the line PR. Mark the point where the normal meets PR with the letter Q.
On Fig. 1.1, draw a line of length 14.0 cm from point M at an angle $\theta = 10^\circ$, as illustrated in Fig. 1.2. Label the other end of the line O.
On Fig. 1.1, draw a line connecting M to X1 and X2. Extend the line until it crosses PR and label the point where it crosses PR with the letter T.
Measure the length a of the line QT in centimetres to the nearest millimetre and the length b of the line MT in centimetres to the nearest millimetre. Write your measurements below and in Table 1.1.
Calculate the ratio $r = \frac{a}{b}$. Enter your answer in Table 1.1. Give your answer to 2 significant figures.
State if you agree with the student. Use values from Table 1.1 to justify your answer.
Suggest what the student can do to have more confidence in their answer to part (e).
Suggest one source of inaccuracy in this experiment, even if it is carried out very carefully.