L2- image formation Flashcards
what happens to parallel light rays travelling towards a spherical surface ?
they will refract as they cross the interface between two media of different refractive index
what does snell’s law do?
allows us to assess how much rays refract
why are the normals not parallel to each other even though the rays coming in to the surface are parallel?
because the surface is curved, angle of incidence are not parallel to one another, this results in rays converging to a point after refraction as each rays refracts by a different amount
what happens to rays as they go from low to high refractive index?
rays will refract towards normal
what is an important property of spherical surfaces?
they can change direction of parallel rays so they converge to single point after refraction
what is image formation?
light carrying information about an object to another place
what is object space?
region in space where light rays travel towards an optical system
what is image space?
region in space where light rays travel away from an optical system
what is ideal image formation?
all points converge to a perfect point
what is non-ideal image formation?
information is spread over a larger area and becomes blurry
all optical systems are non-ideal-not perfect
why do object rays converge to a point?
because its a spherical surface
what happens to rays as they get further away from optical axis?
the rays misbehave and meet at different point and refract more
what is paraxial region?
region not too far from optical axis and image is good enough
when will we consider image ideal?
.image is considered when paraxial region is considered
.we only consider rays that are travelling close to optical axis
How is an object observed through a prism?
Displaced
