Respuesta :

In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.  

Google Glass uses a projector that bounces a beam of light off a prism and projects the image directly on your retina. This was shown and explained the day it was launched.
     

I hope it helps, Regards.