DOI Page / Citation link:
https://doi.org/10.11588/diglit.62828#0444
of incident rays from the poll meet, that point is termed the
point of incidence; and if from the top of the poft a perpendi-
cular be let fall, it will form a triangle; and if that triangle be
bifedted; that is, by drawing a parallel line from the point of
incidence b, cutting the perpendicular at c, then the angle c, bs
is the angle of incidence, and c, d, b, the angle of reflection,,
which are equal. Therefore if an object be perpendicular to
the horizon, its reflected image on water will alfo be perpendi-
cular, but in an inverted pofition to the objedt which refledts.
the image. And whatever angle of obliquity any objedt makes
with the ground, the fame will be its refledtion to the furface
of the water.
The refledtions of images on water are the fame as thofe in
a plain mirror. The furface of the mirror or looking-glafs is
the plane of refledtion; and it is evident, that in whatever pollu-
tion any objedt is. prefented to it, the fame will be that of its re-
fledtion on the faid plane. If a rod, See. be placed perpendicular
to the mirror, its refledted image will be perpendicular to it alfo.
And if one end of it touch the glafs, its image will alfo appear
to touch the furface of it; or if it is withdrawn, its image will
appear equally removed from the refledting plane. This expe-
riment is within the reach of every one, and will be fuflicient
to convince any of the truth of the above propofition.
Example
point of incidence; and if from the top of the poft a perpendi-
cular be let fall, it will form a triangle; and if that triangle be
bifedted; that is, by drawing a parallel line from the point of
incidence b, cutting the perpendicular at c, then the angle c, bs
is the angle of incidence, and c, d, b, the angle of reflection,,
which are equal. Therefore if an object be perpendicular to
the horizon, its reflected image on water will alfo be perpendi-
cular, but in an inverted pofition to the objedt which refledts.
the image. And whatever angle of obliquity any objedt makes
with the ground, the fame will be its refledtion to the furface
of the water.
The refledtions of images on water are the fame as thofe in
a plain mirror. The furface of the mirror or looking-glafs is
the plane of refledtion; and it is evident, that in whatever pollu-
tion any objedt is. prefented to it, the fame will be that of its re-
fledtion on the faid plane. If a rod, See. be placed perpendicular
to the mirror, its refledted image will be perpendicular to it alfo.
And if one end of it touch the glafs, its image will alfo appear
to touch the furface of it; or if it is withdrawn, its image will
appear equally removed from the refledting plane. This expe-
riment is within the reach of every one, and will be fuflicient
to convince any of the truth of the above propofition.
Example