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Angle Angle of Incidence appear Aqua fortis arithmetical mean Attraction Axis beam of Light blue Bodies breadth Bubbles cause Circles colour'd compound concave convex copiously Crystal dark density Diameter dilated distance easy Reflexion edges emerge equal Experiment faint fall farther Fits of easy fix'd flected frangible Fringes greater green hole homogeneal Light illuminated Image PT Inch incident Rays indigo Knives least refrangible Rays length Lens less manner Medium middle mix'd Mixture Motion Muscovy Numbers Object-glasses obliquely Observations Oil of Vitriol Opticks orange parallel Particles pass perpendicular placed Plane Plates of Glass Prop propagated Proportion rarer Rays of Light Rectilinear Sides reflected Light Rings of Colours Salt Salt of Tartar second Prism Sensorium Shadow Sine of Incidence Sine of Refraction sorts of Rays Spectrum PT Speculum Substances Sun's Light Surface thence thickness thin Plates third tion transmitted transparent Vapour violet Water yellow
Page 26 - In a very dark Chamber at a round hole about one third part of an Inch broad made in the Shut of a Window I placed a Glass Prism, whereby the beam of the Sun's Light which came in at that hole might be refracted upwards toward the opposite Wall of the Chamber, and there form a coloured Image of the Sun.