Optics Flashcards
light is both a ….. and a …..
wave, particle.
what happens when the waves amplify each other?
they are constructive and create the light bands we see.
what are waves?
a disturbance that transfers energy from one point to another without transferring matter.
what is a medium?
any physical disturbance that acts as a carrier for the transmission of energy
what is radiation?
a method of energy transfer that does not require a medium
what is the order of electromagnetic radiation?
(longest to shortest) R radio M microwaves I infrared V visible U ultraviolet X x-ray G gamma rays
show how the eye-brain sees the image of the object:
draw the diagram
what are the 2 parts that make up a mirror?
a sheet of glass and reflective silver/aluminum
what is the purpose of each part of the mirror?
the reflective part is shiny film on the back and the glass protects the film and helps make the mirror look better
what does ‘normal’ mean?
the line to the mirror’s surface
what does ‘angle of incidence’ mean?
angle between ray of incident and normal ray
what does ‘angle of reflection’ mean?
angle between ray that reflected and normal ray
state the 2 laws of reflection:
- angle of incidence equals the angle of reflection
2. incident ray and normal lie in the same spot (co-plannar)
what’s the difference between specular reflection and diffuse reflection?
specular - reflection of light off a smooth, shiny surface
diffuse - reflection of light off an irregular or dull surface
what is an incident ray?
(incoming ray) the ray which meets the mirror at the point of incident
what is a reflected ray?
the ray which reflects off the mirror from the point of incidence
what are the 4 SALT characteristics of an image in a plane mirror?
S - size (larger, same, smaller)
A - attitude/inversion (upright, inverted)
L - location (same distance between the mirror)
T - type (virtual, real)
concave is also known as:
diverging mirror
- causes parallel light rays to come to a point
convex is also known as:
converging mirror
do snells law word problems:
:)
the critical angle is the angle of incidence when what happens?
when the refracted angle is 90º
what is the critical angle of glass?
41º
what is the critical angle of diamond?
24º
label the parts of the eye:
- iris
- pupil
- cornea
- lens
- retina
- optic nerve
what is hyperopia?
far-sightedness
- can see far but not close
- light focuses past/behind the retina
- to fix, convex/converging lens is needed
what is myopia?
short-sightedness
- can see close but not far
- light focuses in front of the retina
- to fix, concave/diverging lens is needed
lens equations table
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