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Post on 13-Jul-2015
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•Always travels in a straight line. This is
the rectilinear propagation of light
•Speed = 300,000 m/s
•Travels in the form of wavelength
When light hits any surface and
bounces back ,it is called reflection .
There may be two types of reflection :
Diffuse reflection
Clear reflection
From a rough
surface
The rays may go in
any direction
Image generally
not formed
The surface will
not act as a mirror
Real : An image which forms on a screen
Virtual : An image which is formed inside
the mirror
Erect :straight
Inverted : an image which is not straight
Lateral inversion : when left side appears
on right and right appears on left side
•NATURE OF THE IMAGE :
•Laterally inverted
•Erect
•Same size
•Distance between object and the mirror is same as the distance
between the image and the mirror
•Virtual
surface normal
same
angleincident rayexit ray
reflected ray
•Angle of incidence = Angle of reflection
•Normal , incident ray and the reflected ray
, they all lie on the same plane.
Parallel rays
Reflected rays
Real
Focus
Focal length = +
Forms real, inverted,
Reduced or enlarged
Image. Also forms
Virtual, erect,
Enlarged images.
OBJECT IMAGE NATURE
BETWEEN P AND
F
BEHIND THE
MIRROR
ERECT,VIRTUAL,ENLARGED
AT F NO IMAGE -
BETWEEN C
AND F
BEYOND C INVERTED,REAL,LARGE
AT C AT C INVERTED,SAME SIZE ,REAL
BEYOND C BETWEEN C AND
F
INVERTED, REAL,SMALL
Parallel rays
Reflected rays
Virtual focus
Focal length = -Forms only virtual,
erect, reduced
images between
the virtual focus
and the mirror.
OBJECT IMAGE NATUREBETWEEN P AND F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
AT F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
BETWEEN C AND F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
AT C BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
BEYOND C BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
focus (f)focus (f) 2 f2 f
x x x x
Parallel ray
Passes thru
The focus
Refracts parallel
To principal axis
A ray thru the
Center of the
lenses
Remains
unbent
OBJECT IMAGE NATURE
BETWEEN P AND
F
BEHIND THE
MIRROR
ERECT,VIRTUAL,ENLARGED
AT F NO IMAGE -
BETWEEN C
AND F
BEYOND C INVERTED,REAL,LARGE
AT C AT C INVERTED,SAME SIZE ,REAL
BEYOND C BETWEEN C AND
F
INVERTED, REAL,SMALL
OBJECT IMAGE NATUREBETWEEN P AND F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
AT F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
BETWEEN C AND F BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
AT C BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
BEYOND C BETWEEN P AND
F(INSIDE THE
MIRROR)
VIRTUAL,ERECT,SMALL
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