Photograph of the experimental set-up.
The distance of the beaker and Mac speaker is 5cm. The numbers on the markings are not displayed clearly enough in the photograph due to poor photo quality. However, 5 markings can be visibly counted from the mouth of the beaker to the bottom of the Mac and hence, 5 cm.
Photograph of the hands lens used in the experiment. Courtesy of the school's biology lab. 
Photograph of the transparent beaker used in the experiment.
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