The photograph fo a house occupies an area of `1.7cm^2` on a 35 slide. The slide is projected on to a screen, and the area of the house on the screen is `1.55m^2` What is the liner magnification of the projector screen arrangement?

A 35 mm wide slide with 24 mm xx 36 mm picture is projected ona screen placed 12 cm from the slide. The image of the slide picture on the screen measures 1.0 m xx 1.5m . What is the linear magnification of the arrangement ?

A slide projector gives magnification of 10. If it projects a slide of 3 cm xx 2 cm on a screen, the area of image on screen is :

A film projector magnifies a 100cm^(2) film strip on a screen. If the linear magnification is 4, the area of the magnified film on the screen is

The length of a rectangle is 7.1cm and its breadth is 2.5cm. What is the area of the rectangle?

A slide projector produces 500 times enlarged image of a slide on a screen 10 m away. Assume that the projector consists of a single convex lens used for magnification. If the screen is moved 2.0 m closer, by what distance should the slide be moved towards or away from the lens so that the image remains focused on the screen ? What is the magnification in this case ?

A convex lens produces an image of a real object on a screen with a magnification of 1/2. When the lens is moved 30 cm away from the object, the magnification of the image on the screen is 2. The focal length of the lens is

Calculate the linear magnification of a square of side 2mm, which when projected on a screen, gives an image of a square of side 2cm.

An object and a screen are fixed at a distance d apart. When a lens of focal length f is moved between the object and the screen, sharp images of the object are formed on the screen for two positions of the lens. The magnifications produced at these two positions are M_(1) "and" M_(2) -