Question

A movie projector forms real images. Why is it not inverted?
A.Real images are erect in nature.
B.Final image is formed using a virtual image.
C.Multiple mirrors are used.
D.Films are inverted.

Answer 1

Hint: Movie projectors are the devices that are capable of projecting images on a screen that is usually plain and white in color. We can see the movie projectors at various places like the movie theatres, auditoriums, etc. but most of them have been replaced by new technological devices.

Complete answer:
A movie projector forms real images because multiple mirrors are used in a movie projector. The light that comes from the reel when it gets focused on the first lens, it forms a real and inverted image. Then again, the light strikes the screen and finally forms an erect image on the screen. The images formed each time are inverted and this process happens two times, thus the final image that we get is erect. Concave mirrors are used to focus the light at first which creates a virtual image and then with the help of another concave mirror a real and erect image is formed. Thus, the correct option out of the given options is $C$ because the image is inverted twice due to which it finally turns out to be erect.

Note:
The distance between the object and the mirrors plays a vital role, because if the distance between the mirror and the object is small then the size of the image is larger. Hence in case of movie projector, when the size of the image is to be increased as compared to the size of the object then the distance between the object and the mirrors is kept small.