How does a light sensor work?

[Phillips2207]

Can anyone tell me how does a light sensor work?

 

[mgb_phys]

What type?

There are a few different mechanisms depending on how sensitive you need, how fast a response and how much you want to pay.
Generally the light either generates electricity or changes the electrical characteristics of an element in such a way that you can measure the change with a circuit.

 

[Claude Bile]

Try googling "Photodiode".

Claude.