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Page 21 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 21 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 134 - The sine of the angle of incidence bears a constant ratio to the sine of the angle of refraction.
Page 1 - The straight line or distance be-tween the centres of the transverse lines in the two gold plugs in the bronze bar deposited in the office of the Exchequer...
Page 8 - If a number of forces acting at a point can be represented in magnitude and direction by the sides of a closed polygon taken...
Page 131 - All practical photometers are based upon the fundamental law that the intensity of illumination on a given surface varies inversely as the square of its distance from the source of light...
Page 137 - Let the mirror be rotated through an angle a about an axis through O perpendicular to the plane of the paper and let OR and OG be the positions of the reflected ray and normal after the rotation.
Page 159 - Usually, when the eye is at rest, it is adjusted so that the image of a distant object is in focus on the retina.