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Pinhole camera

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Which of the following statements are correct? (i) The shape of a shadow depends on the position of the source of light. (ii) A plane mirror can change the direction of light falling on it. (iii) A pinhole camera forms an erect image of an object on a screen. (iv) A shadow is formed when light passes through a transparent object .

Light travels in a straight line. This principle is illustrated in a pinhole camera. In this simple device the image of an object is formed on a photographic plate by light passing through a small hole. In one experiment, 5 cm high image of a tree was obtained on a photo plate placed at a distance of 15 cm from the pin hole. Actual height of the tree is 20 m. (a) Find the distance of the pinhole from the tree. (b) How is the size of image affected if the photo plate is moved away from the pinhole? (c) What will happen if a large hole is made in place of a pin hole?

In a pin-hole camera, we usually get

Write two advantage and two disadvantages of a pin hole camera.

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 ?

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.