Q. Which quantity is dimensionless?

कौन सी मात्रा आयामहीन है?

A
Refractive index
अपवर्तनांक
B
Force
बल
C
Work
काम
D
Acceleration
त्वरण

Explanation

Refractive index = speed of light in vacuum / speed of light in medium
It is a ratio of two quantities with the same unit, so it has no dimensions.

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