Gallium phosphide Index of Refraction 1.0000 1.0003
1.3100 1.3330 1.3600 1.5100 1.5200 1.5800
1.6600 1.9230 2.4170 2.9070 3.5000
Dispersion The separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating.
Rainbows White light separates into different colors (wavelengths) on entering the raindrop because red light is refracted by a lesser angle than blue
light. On leaving the raindrop, the red rays have turned through a smaller angle than the blue rays, producing a rainbow. Lenses
Converging Lens Rules For Converging Lenses 1) Any incident ray traveling parallel to the
principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens. 2) Any incident ray traveling through the focal point on the way to the lens will refract through
the lens and travel parallel to the principal axis. 3) An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens. Image Formation by Converging Lens
Diverging Lens Rules For Diverging Lenses 1) Any incident ray traveling parallel to the
principal axis of a diverging lens will refract through the lens and travel in line with the focal point (i.e., in a direction such that its extension will pass through the focal point). 2) Any incident ray traveling towards the focal
point on the way to the lens will refract through the lens and travel parallel to the principal axis. 3) An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
Diverging Lens Image Formation Always Virtual, Smaller, and Right-Side Up
The Human Eye The Human Eye Normal Eye Focus
Near-Sighted (Myopia) Far-Sighted (Hypermetropia)
Astigmatism Cornea is oval shaped instead of spherical. This causes light to focus on two or more spots. LASIK
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