Point Perpendicular Light was created in 1899.
A normal ray in a diagram of reflection of light represents the perpendicular line drawn at the point of incidence on a mirror or reflecting surface. It is used to show the angle of incidence and angle of reflection in relation to the mirror's surface.
Lambert Point Light was created in 1872.
Stratford Point Light was created in 1822.
Danskammer Point Light was created in 1915.
Jordan Point Light was created in 1855.
Eastern Point Light was created in 1832.
Mathias Point Light was created in 1876.
Monomoy Point Light was created in 1849.
Robertson Point Light was created in 1910.
Tree Point Light was created in 1904.
Point Adams Light was created in 1875.
Leading Point Light was created in 1868.