T.O Subdivisions or Elemental Units of Light (prelims)
Divergent Pencil
- Light rays spread apart as if originating from a point - within infinity
Emergent vergence (VE)
- Vergent of light upon leaving the lens - does not pass through opaque
Beam of light
Biggest subdivision of light
Beam of light
Collection of divergent, convergent, or parallel pencils arising from an extended source
Pencil of light / Bundle of rays
Collection of light rays
positive
Convergent pencils have ____ vergence
20 ft / 6 m
Distance of optical infinity
Negative
Divergent pencils have ______ vergence
Vergence
General term by which the convergence or divergence of light may be expressed
Divergent
Light coming from point source is always _____
Minus / concave
Light passing through a _____ becomes divergent
Plus / convex
Light passing through a ______ becomes convergent
Parallel
Light rays are parallel coming from infinity
Convergent pencil
Light rays come together to meet at a single point
Parallel pencil
Light rays coming from infinity
Parallel Pencil
Light rays that never meet
Zero
Parallel pencils have ________ vergence
Light ray
Pencil of light / 1. 2. 3. The path of a single photon or particle of light from a single point on a light source
Diopter
Reciprocal of a meter (1/100 of a meter)
Light ray
Smallest elemental unit of light
Extended source
Source of light which could illuminate a certain area
1. Light ray 2. Pencil of light / Bundle of rays a. Divergent Pencil b. Convergent Pencil c. Parallel Pencil 3. Beam of light
Subdivisions of Light
Vergence
The reciprocal of the distance from the point in question to the source or focus
Diopter
Unit of vergence
V=1/d
Vergence formula
incident vergence (VI)
Vergent of light upon hitting the lens