Real meaning of power

Mean optical power launched into an 8 km fibre is 120 muW and mean output power is 4 muW , then the overall attenuation is (Given log 30=1.477 )

find the opposite meaning of underline The poet said that poetry is a spontaneous overflow of powerful feelings

find out the similer meaning of underline The preacher said, “No one is above the all powerful"

Formula for dispersive power is (where symbols have their usual meanings) or if the refractive indices of crown glass for red, yellow and violet colours are respectively mu_(r),mu_(y) and mu_(v) then the dispersive power of this glass would be

Show that the power of the achromatic combination of two convex lenses of the same material is equal to the mean power of the lenses.

Power gain of transistor amplifier with common base circuit or common emitter circuit is large. Does it mean the power is generated by the transistor? Explain.