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(a) Relate the speed of light in the given medium with its optical density.
(b) Using the information given in the table below, arrange the medium A, B and C in the ascending order of their optical density.
begin{tabular}{|c|c|}
hline Medium & Speed of light (m/s)
hline A & $2.25 \times 10^8$
hline B & $2 \times 10^8$
hline C & $2.08 \times 10^8$
hline
end{tabular}
(b) Using the information given in the table below, arrange the medium A, B and C in the ascending order of their optical density.
begin{tabular}{|c|c|}
hline Medium & Speed of light (m/s)
hline A & $2.25 \times 10^8$
hline B & $2 \times 10^8$
hline C & $2.08 \times 10^8$
hline
end{tabular}
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(a) In optically rarer medium speed of light is more and in optically denser medium speed of light is less. (1 Mark)
(b) $A < C < B$ (1 Mark)
(b) $A < C < B$ (1 Mark)