InterviewSolution
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InterviewSolution
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Have you seen a photographic camera in which a film is used ? Compare the human eye with it. Ste similarities between them. State the points of difference between them. |
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Answer» Solution :Yes, we have seen a photographic CAMERA in which a film is used. CAMERAS , in general , have various shapes and sizes. Some cameras are much bigger than the human eye while soke are smaller than the human eye. Here we shall consider a SIMPLE camera. Similarities : In the case of a camera as well as the human eye, it is possible to control the amount of incoming light with the help of a diaphragm and an aperture. Both use a convex lens for focusing . The photographic film in a camera is coated with a photosensitive material. The retina in the eye consists of a large NUMBER of light sensitive cells. The photographicfilm in a camera is processed using chemicals and then prints (photographs) can be obtained using the appropriate paper. In the human eye, the electrical signals generated by light sensitive cells are passed by optic nerves to the BRAIN which interprets them . Differences : Cameras come in a variety of sizes and shapes unlike the human eye. Unlike the human eye, a wide variation in exposure time is possible in the case of cameras. The human eye is sensitive in the visible region (red to violet) of the electromagnetic spectrum , whilea much wider range of the electromagnetic spectrum can be covered with cameras designed for specific purposes. In comparison with the human eye, a wider view and range can be covered by a camera. In comparison with the humaneye, a wider intensity (of light) range can be covered with a camera. The retina is indispensible in the human eye, while cameras without a photographic film have been designed with the help of photographic film have been designed with the help of photosensitive materials and are in current use. |
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