solar panels

1.does anyone know why the solar panel is equipped with a sheet of glass over it?

2.what is the function of the insulation behind the pipes?

thanks

http://en.wikipedia.org/wiki/Photovoltaic_module

I believe that reading up on this will help you out.

Control+F 'glass' and 'insulat' ( without the e )

bonkly, after reading, can post the answers… Smile
will like to know.