Question

what do you mean by power and explain write its unit and Measurement​

Answer 1

Power is defined as the reciprocal of the focal length in metre

P= 1/f(m)

It is measured in dioptre

Answer 2

Power: It is the ability or capacity to do some work...

Power = Work done ÷ Time taken

Electrical Power = Voltage × Current

Units:

P = W ÷ T

P = (F × s) ÷ t

P = Nm/t

P = Newton Metre per second or Watt

Dimensions:

D = [MLT-2][L]÷[T]

D = [MT-2]