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How can we get this (in human eye) same image distance for various positions of objects? |
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Answer» 1. The ciliary muscle attached with eye lens helps to change the focal length of eye lens. 2. When the eye is focused on a distant object, these are relaxed. So the focal length of eye lens increases to its maximum value. 3. F(max) – 2.5 cm,u = oo, v = 2.5 cm. The parallel rays coming from a distant object are focussed on the retina with 2.5 cm image distance. 4. When the eye is focused on a nearer object the muscles are strained. So the focal length of the eye lens decreases its minimum value. 5. F(min) = 2.27 cm, u = 25 cm, v = 2.5 cm. The rays from an object (u = 25 cm) at L (point of least distance of distinct vision) are focused on the retina with 2.5 cm image distance. |
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