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ĐĄĐThe minimum power of eye lens is 40 D. If the far point of normal eye is infinity, find the size of the eye ball.CI |
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Answer» Size of the eyeball would indicate the distance between the eye lens and the retina. As the image is formed on the retina, the size of the eyeball would be equal to the image distance (v).Now, as the object distance is infinite, we know that the image will be formed on the focus. So, here v = f (focal length). Now, as we know that,P=1/fP= 40 D40=1/ff=140f= 0.025 meters = 2.5 cmfocal length=2.5 cm Therefore, size of eye ball is 2.5 cm |
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