The book Modern Optical Instruments And Their Construction was written by author Henry Orford Here you can read free online of Modern Optical Instruments And Their Construction book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Modern Optical Instruments And Their Construction a good or bad book?
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sclerotic. This is commonly termed the white of the eye. The part which protrudes is covered with an extremely strong and thick transparent membrane, wdiich is called the cornea. The eyeball has also two other linings: just within the sclerotic is a thin membrane called the choroid, and within that there is another thin lining called the retina. The interior of the choroid is covered with a black ANI> THEIR CONSTRUCTION 3 pigment, which gives it a velvety appearance. Its use is to absorb rays o...f light which have passed through the retina, and prevent them from being reflected back on it, and interfere with the images there formed. The Iris. — The anterior portion of the choroid, separ- ating from the sclerotic, is thickened and forms the iris, which is a contractible curtain perforated by an aperture in the centre, called the pupil. The outer edge of the iris is fixed, but the centre may be contracted by a strong muscular band running round it, which allows the size of the pupil to be changed.
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