Question

what is a power factor

Answer 1

in a.c. circuit, as we know power in a.c, circuit is given by

P=I²Z cosp

here cosp is called the power factor.

it come in role due to inductor or capacitor in the circuit. Also reactance depends upon the frequency of the input a.c., voltage(or circuit).


In spherical refracting surface
the power of spherical refracting surface is given as

P=n2 -n1/R
where n2 is refractive index of object space and n1 is refracting index of image space and R is radius of curvature of spherical refracting surface.