John Rodrigues Ideally, you should have different images according to screen size.
You need images for the following widths ideally,
>768 px -- mobiles
>992 px -- tablets
>1200 px -- desktops
>=1200 px -- larger devices
The height will correspond to the aspect ratio 1width:height = 16:9`
Looks like this question is best answered by Anton Voltchok and Robert Lancer