Lesson 10 Flashcards
Vision takes place when Faye’s of light from an object/objects are
Brought together in focus on the retina of the eye
When light travels, it behaves in two ways:
- Like a wave generate by dropping a rock into a pond
2. Like a particle or photon
As wavelength changes, so does the
Perceived color of light
Wavelengths of light visible to humans vary in length from
380 to 760 nm
What’s a luminous / primary source
One that generates light
What’s a secondary source
A source that reflects light from a primary source
A single ray of light travels in a straight line unless it
Bumps into a highly reflective object
What’s the angle of incidence (i)
Angle at which light strikes the surface
What’s the angle of reflection (r)
The angle at which a ray is reflected
What’s a rarer medium
A medium of less resistance
What’s a denser medium
A medium of more resistance
The refractive index is a number which
Represents the amount of resistance to the speed of light
What’s the equation for relative refractive index
Speed of light in air / speed of light in new substance
What’s the wave front
The outer border of the circle of light
For spectacle lenses, the more important focal point is
F’
The vengeance of light entering the lens and the lens power equals to the
Vergence of light leaving the lens
