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State the function of each 1.cornea2.iris3.pupil4.retina |
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Answer» \tIrish: Irish is made of muscles. They control the size of opening of pupil.\tPupil: Pupil is the round black spot in front of eye. It regulates the amount of light entering the eyes. Pupil works like aperture of a camera. In case of dim light pupil dilate to allow more light to enter the eyes. In case of strong light pupil constrict allowing less light to enter.\tRetina: Retina works like a screen or camera film. Retina is full of light and colour sensitive cells. These cells, upon receiving image send electrical signals to the brain, which processes these information to make a mental image of what we see. The photoreceptor cells in the eye are of two types, viz. rod cells and cone cells. The rod cells are sensitive to dim light. The cone cells are sensitive to bright light and colour. 4.Retina : it receives the light and send the information to the brain. It consists of cones and rods |
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