While delivering presentation: how do I look at Notes?

Answer: Look at your notes in a deliberate manner and let the students know that you are consulting them.

After you finish a slide, look at your notes in a deliberate manner, don't glance surreptitiously at the notes as if you're trying to make it seem that you're not looking at or consulting notes.

It may seem long to you, but student's do not mind it. In fact, they get a breather to grasp the things explained at the previous slide.