Physics

Which of the following is a unitless and dimensionless quantity ?


ANSWER

Refractive index


SOLUTION
The dimensions of a physical quantity are the powers (or exponents) to which the base quantities are raised to represent that quantity. 

Angle and solid angle has radians as units.
Mechanical equivalent of heat has joules as unit
.
Refractive index of a material is a dimensionless number.
$$n=c/v$$
n $$ =  $$ refractive index
c $$= $$ speed of light in vacuum
v $$= $$ speed of light in medium
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