A student investigates the deviation of a ray of light passing through a transparent block ABCD and measures a quantity called the refractive index $$\(n\)$$ of the block. Measure the length $$\(l\)$$ of $$\(\mathbf{E H}\)$$. $$\[ l= \]$$ ............................................... cm (ii) Measure the perpendicular distance $$\(d\)$$ between the line $$\(\mathbf{H J}\)$$ and the line FZ. $$\[ d= \]$$ ............................................... cm (iii) Calculate $$\(\frac{d}{l}\)$$. $$\[ \frac{d}{l}= \]$$ .....................................................

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