What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
angle angles of incidence appear becomes body called centre colours concave lens concave mirror conjugate focus converge curvature defect denote deviation diameter Dispersion of light dispersive power distance distance of distinct distinct vision diverging divided double concave double convex lens equal equation evident EXAMPLES experiment eye-glass facts fall feet figure find conjugate focus Find the focal Find the principal focal length foci formula front given glass Hence image mn Images formed inches incident focus incident rays Laws lens of glass lenses magnifying power magnitude manner measured negative object observed opposite optical parallel rays pass pencil pencil of light perpendicular person placed plane point Q position principal focus prism produced proportion radii radius ratio ray of light reflected reflexion refractive index respectively seen shown side sines situated spectacles suppose surface Table tance telescope thin tion violet
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 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.