cylindrical concave
spherical convex
parabolic concave
plane
The unit for measuring electric power is the
The unit of electrical power is
The unit of energy in MKS system is
The unit of force is a
The unit of noise pollution (level) is :
The unit of Plancks constant is
The unit of specific heat capacity is
The unit of viscosity is
The velocity of heat radiation in vacuum is
The velocity of light in vacuum can be changed by changing