The science of light . Fig. 20. Eve 4-—-x-; -vtr,r--. Fig. 21. therefore be gradually turned upward from the ground,so that ultimately they are turned upward just as if theyhad been reflected in a sheet of water. The paths oftwo of the curved rays reaching the eye from two pointsA and B are shown in Fig. 21, and the rays are producedbackwards in the directions in which they reach the c 34 THE SCIENCE OF LIGHT eye, thus showing the apparent positions of the twopoints to be very like what they would have been ifthere had been reflection at a sheet of water. Note on the Sine of an Angle.—In any r
The science of light . Fig. 20. Eve 4-—-x-; -vtr,r--. Fig. 21. therefore be gradually turned upward from the ground,so that ultimately they are turned upward just as if theyhad been reflected in a sheet of water. The paths oftwo of the curved rays reaching the eye from two pointsA and B are shown in Fig. 21, and the rays are producedbackwards in the directions in which they reach the c 34 THE SCIENCE OF LIGHT eye, thus showing the apparent positions of the twopoints to be very like what they would have been ifthere had been reflection at a sheet of water. Note on the Sine of an Angle.—In any right-angledtriangle the side opposite to one of the angles dividedby the hypotenuse of the triangle is called the sine ofthat angle, and if we denote that angle by A it is usuallywritten sin A. On observing Fig. 22 it is evident thatwhen A is small sin A is also small, for the side oppositeto A is only a small fraction of the hypotenuse. As A approaches in magnitude toa right angle the side oppositeto it becomes more and morenearly equal to the hy
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlight, bookyear1910
