Question
Out of air and glass, which is optically rarer? Give reason.
✓
Answer
Air is $\text{RARER}$ as the speed of light in air is more than the speed of light in glass.
$3 \times 10^8 ms^{-1} > 2 \times 10^8 ms^{-1}$
speed of light in air $>$ speed of light in glass
$3 \times 10^8 ms^{-1} > 2 \times 10^8 ms^{-1}$
speed of light in air $>$ speed of light in glass
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