If the cinema screen projects real image and we know real image are always inverted then why the movie to be projected is erect(why we dont see film upside-down)?
Asked by jatin452002 | 8th Jun, 2017, 03:24: PM
This is a genuine query with a conceptual backdrop. A cinema projector uses a reel on which light is incident, which is then focussed by a lens to form a real image on the screen. But the thing that has to be understood is that inverted does not mean upside down always. This principle is used in a pinhole camera too.
So, the light from reel is focussed on a lens which forms a real inverted image and this light is then sent out from an opening which inverts the image further forming an erect image on the screen.
Answered by Romal Bhansali | 9th Jun, 2017, 09:46: AM
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