K.C.S.E Physics Q & A - MODEL 2006PP2QN19

K.C.S.E Physics Q & A - MODEL 2006PP2QN19

​(a) Define the refractive index of a substance 
(b) In an experiment to determine the refractive index of a liquid, the liquid was poured into a measuring cylinder. A pin was placed at the bottom of the cylinder and another pin was used to locate the apparent position of the first pin. The real depth and apparent depth were measured. The experiment was repeated with other values of real depth. The table below shows the results obtained.

​(i) Plot the graph of real depth against apparent depth 
(ii) From the graph determine the refractive index of the liquid 
(c) Figure 9 shows a ray of light incident on a glass – air interfac

​Given that the refractive index of the glass is 1.6. Determine angle θ

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