At what rate the images pass one after the other on a cinema screen?

What type of image (real or virtual) is formed on a cinema screen?

Can a real image be taken on a screen ?

Name the lens used to obtain the image on a screen.

A concave mirror forms a real image three times larger than the object on a screen. The object and screen are moved until the image becomes twice the size of the object. If the shift of the object is 6cm, find the shift of screen.

A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that, he moves gradually the flame towards the lens and each time its image on the screen. (a) In which direction does he move the lens to focus the flame on the screen? (b) What happens to the size of the image of the flame formed on the screen ? (c ) What difference is seen in the intensity (brightnees) of the image of the flame on the screen ? (d) What is seen on the when the flame is very close (at about 5 cm) to the lens ?

A thin converging lens is placed between an object and a screen whose position are fixed. There are two positions of the lens at which the sharp image of the object is formed on the screen. Find the transverse dimension of the object if at one position of the lens the image dimension equal h' = 2.0 mm and at the other, h'' = 4.5 mm .