# Manual of optics, by J.A. Galbraith and S. Haughton

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Page 18 - 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 22 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
Page 16 - The magnifying power of a simple microscope is the ratio of the size of the image to the size of the object.
Page 30 - A luminous band composed of seven magnificent colours is displayed on the screen in the following order : — Violet, indigo, blue, green, yellow, orange, red. The...
Page 15 - Hence we may conclude that the image of a body seen in a convex mirror is always behind the mirror, and less than the object in the ratio of mn : MN, ie in the ratio of nC : NC, the distances of the image and object from the centre of the mirror.
Page 37 - MN be placed inside the principal focus, the divergence of the pencils proceeding from it will exceed the divergence of rays proceeding from the focus; and therefore the effect of the lens will only be to diminish this divergence, and make the rays appear to proceed from an image mn, farther away from the lens than the object, and at the same side. It...
Page 39 - A watch-glass of 5 inches curvature is filled with spirits of turpentine, a beam of parallel rays falling on the surface of the liquid is brought to a focus at a distance of 10.5 inches, required its index of refraction.
Page 9 - Q from the mirror, the distance of q from the mirror, and the radius of the mirror) ; any two of which being given, the third can easily be found.
Page 32 - The focal length of a lens is the distance of the principal focus from the lens.
Page 15 - MN be at a greater distance in front of the mirror than half its radius, the image mn will...