A Hand-book of Optics

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Blanchard and Lea, 1858 - 279 pages
 

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Page 707 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 534 - R" c, passing from glass or water into air, are bent in the directions c I, c i', c i" from the perpendicular c o. 98. This result, being too hastily generalised, is sometimes announced as follows : — When a ray of light passes from a rarer into a denser medium, it is bent towards the perpendicular, and from a denser into a rarer from the perpendicular, which is by no means generally true. Such...
Page 743 - A plane mirror, moveable about an axis in its own plane parallel to the axis of the Earth, revolves from east to west with half the Sun's apparent diurnal motion.
Page 617 - ... distance, the image produced by objects at great distances will become indistinct; and that, on the other hand, when the eye so accommodates itself as to render the image produced on the retina by distant objects distinct, the image produced by an object at twelve inches distance will become indistinct.
Page 580 - Rule 2, if the side whose radius is 2 is turned to parallel rays. 5. The lens which has the least spherical aberration is a double convex one, whose radii are as 1 to 6. When the face whose radius is 1 is turned towards parallel rays, the aberration is only...

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