Photograph of the ground ar taken form an air-craft ,flying at an altutude of 2000m by a camera with a lens of focal length`50cm`.The size of the film in the camera si `18xx18cm`.What area of the ground can be photography by this camera at any one time.

Photograph of the ground are taken form an air-craft ,flying at an altitude of 2000 m by a camera with a lens of focal length 50 cm . The size of the film in the camera is 18xx18cm .What area of the ground can be photography by this camera at any one time.

Photograph of the ground are taken form an air-craft ,flying at an altitude of 2000 m by a camera with a lens of focal length 50 cm . The size of the film in the camera is 18xx18cm .What area of the ground can be photography by this camera at any one time.

An aircraft flying at a altitude of 2000 metre, takes the photographs of the ground by a camera with a lens of focal length 0.5 m. The size of the film in the camera is 12 cm xx 12 cm . What area of the ground can be photographed by this camera at any time ?

The focal length of the lens in a photographic camera is 5cm. what is the power of the lens?

A movie camera with a (single) lens of focal length 75mm takes a picture of a person standing 27m away. If the person is 180cm , tall what is the height of the image on the film ?

A boy is trying to start a fire by focussing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm.The diamerter of the sun is 1.39 xx 10^9 m and its mean distance form the earth is 1.5 xx 10^(11) .What is the diameter of the sun's image on the paper?