If we draw a line from the point of incidence B, perpendicularly, to the mirror, it will divide the angle of incidence, from the angle of reflection, and you will see that they are equal.
This then is the reason why, when I throw a ball obliquely against the wall, it rebounds in an opposite oblique direction, forming equal angles of incidence and of reflection.
The prolonged celibacy has in many armies led to a higher incidence of venereal diseases which prolongs the celibacy and lowers the birthrate.
While there is most decidedly such a thing as the inheritance of a tendency to or lack of resistance to a disease, it is not the result of incidence of the disease on the parent.
In this form the main incidence of the infection is on the sheaths of the flexor tendons, but it is not always possible to determine whether it started there or spread thither from the subcutaneous cellular tissue (Fig.
It is not so much, therefore, the age of the person in whom it occurs, as the age of the tissue in which it arises, that determines the maximum incidence of cancer.
The arrangement of the blood vessels determines to some extent the incidence of disease in bone.
When the main incidence of the infection affects the synovial membrane, the clinical picture may assume the form of a hydrops, or of an empyema in which the joint is filled with pus.
The sense of hearing is one of the most persistent of the special senses during the incidence of sleep.
The darkness of night favors sleep; the presence of light hinders its incidence and renders it less profound.
The regularly recurring incidence of natural sleep forms one of the most important subjects for physiological investigation.
Dreams, also, are not unfrequently excited by the incidenceof light upon the closed eyelids.
It is a cerebral stimulant, and aids in the establishment of that nervous tranquility which favors the incidence of sleep.
At each angle of incidence there would be a particular wave length for which the phases of the several reflections are in agreement.
When the angle of incidence is increased, the band moves in the direction of increasing refrangibility, and at the same time increases rapidly in width.
A convergent beam, reflected at a nearly grazing incidence from the twin planes, depicts upon the screen an arc of light, which is interrupted by a dark spot corresponding to the plane of symmetry.
As the angle of incidence is increased, the reflected light becomes brighter and rises in refrangibility.
If the angle of incidence be small, and if the incident light be polarized in or perpendicularly to the plane of incidence, the reflected light is polarized in the opposite manner.
Even when he was on his feet, the incidence of the act was not always uniform; if promenading with his wife and children, or fishing along a river side, or running to catch a tram, he was not hampered by his affliction.
The only effect which the accident and its consequences had was to intensify the patient's preoccupation and to determine the incidence of the tic.
Unilaterality of distribution is more common in chorea than in tic; in other words, chorea, more or less, follows anatomical lines in the regions it affects, whereas the incidence of tic is physiological.
And always for the same reason--to stop the steadily rising incidence of psychotic maladjustment.
The Japanese report the incidence of burns in patients surviving more than a few hours after the explosion, and seeking medical attention, as high as 95%.
The introduction of these model homes had not had any effect on the incidence of relapsing fever, for the places were still hot-beds of the fever during winter.
The seasonal abundance of the fly is very closely correlated with the incidence of the disease, rising rapidly during the summer and reaching a maximum in July and August, then slowly declining in September and October.
There must be laws of property, succession, and the like, and the influence of these spreads over the whole industrial system, and affects both the character of its production and the incidence of its distribution of wealth.
He did not know the incidence of his act, and we do not know that of ours; therefore let us take heed of the quality of actions and motives, since we are wholly incapable of estimating the sweep of their consequences.
But since M is the reflecting surface and the angle of incidence equals the angle of reflection, the angle AMC is an angle of one-half of one hundred and sixty-one degrees, or eighty degrees and thirty minutes.
The law, as Descartes expressed it, states that the sine of the angle of incidence bears a fixed ratio to the sine of the angle of refraction for any given medium.
I then proceeded to examine more critically what might be effected by the difference of the incidence of rays coming from divers parts of the sun; and to that end measured the several lines and angles belonging to the image.
Denote the distance of the axial object-point O from S by s; the distance from O to the point of incidence P by p; the radius of the spherical surface by r; and the distance OC by c, C being the centre of the sphere.
When the incidence is more oblique than this, the rotation of the plane of polarization is in the opposite direction to the electric currents which would produce a magnetic field of the same sign.
When the light is polarized at right angles to the plane of incidence, the rotation is in the same direction as these currents when the angle of incidence is between 0 deg.
When the light is polarized in the plane of incidence, the rotation is at all angles of incidence in the opposite direction to that of the currents which would produce a magnetic field of the same sign as the magnet.
According to Righi, the amount of rotation when the plane of polarization of the incident light is perpendicular to the plane of incidence reaches a maximum when the angle of incidence is between 44 deg.
The rotation when the light is polarized in the plane of incidence is always less than when it is polarized at right angles to that plane, except when the incidence is normal, when the two rotations are of course equal.
Life, as generally defined, is a state of organized being wherein there is functional activity; while a state, or status, is anincidence determined by environing conditions.
We refer to these several statements of fact for the purpose of emphasizing the true genesis of life as supplemented by "the incidence of different conditions," on which all vital manifestations depend.
We have among nations such a code, and we yet admit the settlement of disputes by war, because the incidence of violence has not yet completely shifted.
If we are to introduce the regime of law among nations as among individuals, our first step must be similarly to shift the incidence of violence.
Still more important is the carrying power of the tailplane, for if it has too much incidence it lifts the rear end and makes the machine dive, while if it has too little the reverse happens.
For instance, the incidence of one side must be greater than that of the other on account of the rotary movement of the propeller.
By the incidence of the wings is meant their upward slope.
It is a statement of the supposed number of deaths during the incidence of the great pestilence in the deanery of Amounderness.
Thus during the incidence of the plague some 21 families on this one manor had disappeared.
During the incidence of the plague ninety of these record a change of incumbent, so that, roughly, about half the benefices were rendered vacant.
In this case colour is related to incidence of light, absence of colour to absence of light.
In society to-day, what one may call the incidence of parenthood, upon which all the future necessarily depends, is determined by nothing other than the humanised form of what Darwin called "sexual selection.
Sullivan points out, alcohol "might certainly be adjudged a salutary evil if its incidence were limited to individuals whose extreme inferiority of organisation renders them wholly undesirable and useless to the community.
It was taught, then, that we inherit a predisposition from consumptive parents, that the bacillus is ubiquitous, and that variations in susceptibility determine the incidence of the disease in one and not in another.
When that is done, alcoholism disposed of, and our milk-supply purified, we may turn to the question of heredity: but the incidence of the disease will then present merely trivial instead of the present appalling proportions.
When the angle of incidence of the plane is small, that is, when it is only slightly tilted from its direction of motion, the greater part of the air reaction is converted into lift.
At a flying angle, that is, when the angle of incidence of the plane is small, the upward force is greatest on those parts of the plane which are immediately behind the leading edge.
The wing which, in order to raise that side of the machine, was presented to the wind at the greater angle of incidence often proved to be the wing which lagged and sank.
We were the first to employ wings adjustable to respectively different angles of incidence in a flying aeroplane.
Neither hath this active good an identity with the good of society, though in some cases it hath an incidence into it.
To be sure, all of the individual curves do not conform with the composite, either in shape or incidence of peak.
The diagram deals with one direction of flight and its incidence across lines of six different slants, lines of identical length oriented in six different ways.
Incidence of maximum peak at the various hours of the night in 1948.
Under these conditions, there would be a lighter incidence of birds in the sample triangle than in the upright triangle beside it (Figure 11, Diagram III).
