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Is it true that medium Y will be optically denser than X when the speed of light in a medium X is point $2.25 \times 10^{8} m / s$ and in a medium Y is $2 \times 10^{8} m / s$ ?

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True

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Detailed Solution

The above statement is true.
When light passes through from an optically rarer medium to the optically denser medium, its speed gets reduced. The denser the medium, the slower the speed will be through the medium and vice versa.

Optical density \propto \frac{1}{speed of light}

Y will be optically denser than X. When the speed of light in a medium X is point

2.25 \times 10^{8} m / s

and in a medium Y is

2 . \times 10^{8} m / s

the speed of light is slowed due to high optical density.
Therefore, medium Y will be optically denser than X.

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