force and pressure, class 8

 











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Human Eye and Colourful World, class 10 Notes

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  SHARMA CLASSES BHARATPUR The Human Eye:  It is a natural optical instrument which is used to see the objects by human beings. ·          It is like a camera which has a lens and screen system. It is a wonderful gift of nature to the human body. Human eye is nearly spherical in shape of diameter about 2.3 cm. It consists of a convex lens made up of living tissues. ·          We need two eyes because a human being has a horizontal field of view of about 150° with one eye and of about 180° with two eyes. Thus, two eyes provide us wider horizontal field of view. With one eye, the world looks flat, i.e., two dimensional only. With two eyes, the view is three dimensional, i.e., dimension of depth is added to our view. ·          As our two eyes are separated by a few centimetres, each eye observes a slightly different image. Our brain combines the two views into one and we get to know how close or far away the things seen are. ·          It is located in the  eye socket . ·
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