A optional instrument of projector for classroom teaching

A optional instrument of projector for classroom teaching
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Hi, everyone. I am thinking about any instrument which can replace classroom project. Actually i have an idea but i need some suggestion on that. I am a mat teacher so i have to show a lot of thing in screen. but there is no availability of project in every class .But i have a mobile to show that thing in my mobile screen. But this screen is too small with respect to class. So can we expand this screen with the help of / without the help of any instrument.

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Might be doable with a OHP film projector.