In this experiment, you will investigate the optical properties of glass jars. You have been provided with two glass jars A and B, each containing water. Each jar has a lid. - Hold the nail next to jar A, as shown in Fig. 2.2. - Close one eye and look at the nail through the water. The bottom of the nail seen through the water will appear to be wider than the top of the nail, as shown in Fig. 2.3. - Move the nail away from the jar. The bottom of the nail will appear to become wider until it suddenly disappears. Hold the nail at this point. - The distance between the nail and jar A is $$\(y\)$$, as shown in Fig. 2.4. Measure and record $$\(y\)$$. $$\(y=\)$$ ..................................................... (ii) Estimate the percentage uncertainty in your value of $$\(y\)$$. Show your working. percentage uncertainty $$\(=\)$$ ................................................. $$\(\%\)$$

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