...is equal in all directions, the light which passes through it must move in a straight lined course. This principle of optics, as well as the following,...takes place in a plane perpendicular to the reflecting furface, at the point of reflection. That is to say, if AB (plate i fig. i) be a ray of light, falling...

...proceeding from the same body. The calorific emanation, therefore, is reflected specularly like light, making the angle of reflection equal to the angle of incidence; and as the specular reflection of light is nothing or nearly nothing, from rough bodies, when it does not...

...is equal in all directions, the light which passes through it must move in a straight lined course. This principle of optics, as well as the following, may be proved by experiment. -light, when it meets ич'гА a polished plane, is teflected, making the angle of "flection equal...

...mirror, a ray of light proceeding from F in the direction FD, would be reflected in the direction DF', making the angle of reflection equal to the angle of incidence. And, since the ellipse may be regarded as coinciding with a tangent at the point of contact, if rays of...

...velocity of the other body. 214. When a perfectly elastic body impinges upon a perfectly smooth plane, it is reflected, making the angle of reflection equal to the angle of incidence. Let AB be a smooth surface, and let an elastic body strike it at C, having moved in the direction DC....

...from F in the direction FD, would be reflected in a line which, if produced, would pass through F', making the angle of reflection equal to the angle of incidence. And, since the hyperbola may be regarded as coinciding with a tangent at the point of contact, if rays of...

...mirror, a ray of light proceeding from F in the direction FD, would be reflected in the direction DF', making the angle of reflection equal to the angle of incidence. And, since the ellipse may be regarded as coinciding with a tangent at the point of contact, if rays of...

...from F in the direction FD, would be reflected in a line which, if produced, would pass through F', making the angle -of reflection equal to the angle of incidence. And, since the hyperbola may be regarded as coinciding with a tangent at the point of contact, if rays of...

...from F in the direction FD, would be reflected in a line which, if produced, would pass through F 7 , making the angle of reflection equal to the angle of incidence. And, since the hyperbola may be regarded as coinciding with a tangent at the point of contact, if rays of...

...from the point c. Again : at the point of incidence d, erect a perpendicular and draw the line de, making the angle of reflection equal to the angle of incidence, and this line must represent the ray reflected from the point d. It will be found that the reflected rays,...