# How the amplitude of light increases its brightness?

Amplitude is the maximum value reached by a wave.

In case of the light wave how the bigger amplitude gives more brightness/intensity ?

• A larger amplitude means that the rate of energy transfer is increased. – Farcher May 26 '18 at 21:35
• @Farcher . i am not understanding also how amplitude increased the rate of energy transfer. can u please explain this ? – Alex May 26 '18 at 21:41
• A travelling wave transports energy (and momentum). – Farcher May 26 '18 at 21:46

From a classical point of view, intensity is proportional to $|A|^2$, so more amplitude implies more energy, and hence more brightness.
• What part don't you understand? If the amplitude $A$ increases, its squared modulus also does. – FGSUZ May 26 '18 at 22:15