(v) The absolute refraction index
(A) is expressed in dioptre (B) is expressed in m/s
(C) of air is about
(D)
has no unit
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A season is a part of a year. ...
In some areas, there are a different number of seasons. ...
In places which are tropical and subtropical, there are two seasons: the rainy (or wet, or monsoon) season and the dry season.
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The absolute refractive index has no units.
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