How do I plot a graph of sin2 θ against 1/h from experimental data?

From your experimental readings (obtained in steps 9 and 10), you will have pairs of values for $\theta$ and $h$. For each pair, calculate $\sin \theta$, then $\sin^2 \theta$. Also, calculate $\frac{1}{h}$.

Examine the range of your calculated $\sin^2 \theta$ values and $\frac{1}{h}$ values. Select a scale for the vertical axis (for $\sin^2 \theta$) and a scale for the horizontal axis (for $\frac{1}{h}$) such that the plotted points occupy most of the graph paper.

Label the vertical axis as $\sin^2 \theta$ and the horizontal axis as $\frac{1}{h}$. Include any relevant units if $\theta$ or $h$ had units that affect the final calculated values (e.g., if $h$ was in cm, then $\frac{1}{h}$ would be in $\text{cm}^{-1}$).

For each pair of calculated values $(\frac{1}{h}, \sin^2 \theta)$, mark a small cross (x) or a dot with a circle around it on the graph paper.

Using a ruler, draw a straight line or a smooth curve that passes as close as possible to most of the plotted points. This line should represent the general trend of the data.

Give your graph a clear and concise title, such as "Graph of $\sin^2 \theta$ versus $\frac{1}{h}$".