Which of the following quantities is dimensionless

Options

A. Gravitational constant
B. Planck's constant
C. Power of a convex lens
D. None of these

Answer

D

Explanation

`[G] = [M^(-1) L^3 T^(-2)] , h [ML^2 T^(-1)]`
Power `=1/("Focal length")=[L^(-1)]`