In a slide show programme, the image on the screen has an area 900times that of the slide. If the distance between the slide and the screen is x times the distance between the slide and the projector lens, then

Try this Material: Convex lens, screen, metre scale, stand for the lens etc. Method: Keeping the screen fixed, obtain a clear image of a distant object like a tree or a building with the help of the lens on the screen. Measure the distance between the screen and the lens with the help of the metre scale. Now tum the other side of the lens towards the screen. Again obtain a clear image of the distant object on the screen by moving the lens forward or backward. Measure the distance between the screen and the lens again. What ls this distance between the lens and the screen called?

In a movie hall, the distance between the projector and the screen is increased by 1% illumination on the screen is

In a movie hall the distance between the projector and the screen is increased by 1%, illumination on the screen is

A convex lens forms an image of an object on a screen ,The height of the image is 9cm The lens is now disiplaced between the object on the screen.the height of this image is 4cm .the distance between the object and the screen is 90cm

Show that the minimum distance between the object and the screen is 4 times of focal length of a convex lens at the time of real image formation.

What is the difference between sliding and slipping ?

In a cinema hall the distance between the projector and the screen is increased by 2%. Now the intensity of illumination of the screen