My charger adapter is original or fake

Salutations Vikramsandhu, 

The following article can help you identify a USB power adapter from Apple. About Apple USB power adapters

Based on the picture, you’ll want to focus on the ‘5W USB power adapter’ section. 

Should you need additional assistance you may want to consider connecting with an Apple authorized service tech to further check out the power adapter. Here’s a link to help with that as well - Choose country or region

Thanks.