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Summary physics 134 geometric optics
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, dashedlines,visual att
is
ane
GEOMETRIC OPTIC3
THE RAY MODEL OFLIGHT
(virtual)
Light propogales in straight lines (light rays)
↳
shadows
↳ laser lights virtual
idea of light rays is used
to describe properties
of light: real
rays come from a source, hitting the mirror than reflect to
↳
reflection and refraction the observer, received rays trace back with the line of sight as
↳ form
image formation by and lenses virtual where the observer
perceives the
light
mirrors
rays come
How do we see an object? (this is where the image is formed)
↳
lightstarts from an object and
goes our in all
directions (light rays), the rays hit the eye images formed by plane mirrors are:
↳ ↳
light rays distort going through objects leg. Water) Virtual
↳ ↳
line of site is where upright but inverted from leftto
you perceive the
image right
In mirrors virtual
↳ (di =do)
you see a
image of
yourself, that As far behind the mirror as the object is in front
↳
image doesn't
actually exist just as
large as the object (hi=no)
I
formation:plane mirrors
image di
incident normal line reflected mirror to check is the
for I
~"
ray ray
a. do object is obserable
Oi-angle of Or:angle of
incidence reflection
⑱ ech
plane mirror
The reflected ray will exito n the other side of the normal MIRRORS
with an equal angle to the angle of incidence, called the
angle of reflection Concave mirror L
parallel light rays
↑
Laws of Reflection ↳
converging convergeto words
the centre
The reflected ray lies in the same plane as the
S
incident
ray
and the normal to the surface at the point of mirror
convex parallel light rays
↳ I
incidence. The 2 rays are on
opposite sides of the normal diverging reflect/diverge outwards
The of incidence equals the of reflection
angle angle
Oi Or
=
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