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CBSE Class 10 Answered

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 | 08 Jun, 2017, 03:24: PM
answered-by-expert Expert Answer
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 | 09 Jun, 2017, 09:46: AM

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