optek

Question 1

Reflection
 Plane Mirror
 A _________ is a mirror with a planar reflective surface.
 For light rays striking a plane mirror, the angle of reflection equals the angle of ______
 Image formation by plane mirror:
 If you stand in front of a plane mirror you see your image ________ the mirror. The location of the image can be diagramed knowing that the surface of the mirror reflects light with an angle of reflection equal to the ________.
 Properties of Image:
 It is formed
 behind the mirror
 it is right side up
 having same size as that of object
 Far behind the surface as the object is in front of it.
 We refer to the image as virtual image.

Answer 1

plane mirror
incidence
behind
incident angle

Question 2

_____________
 A reflecting surface having the form of a portion of a sphere
Ray Diagrams Points:
 One surface of the curved mirror is silvered.
The centre of the sphere is called the _____________
 The geometrical centre of the mirror is called its ______
 The line joining the pole of the mirror and its centre of curvature is called the __________.
 When a parallel beam of light is incident on a spherical mirror, the point where the reflected ray converge on the principal axis is called the __________.

Answer 2

Spherical mirror
centre of curvature C.
pole (P)
principal axis.
principal focus F

Question 3

Uses of Spherical Mirrors:
___________
 Sunglasses
 Vehicle
 Security
 Magnifying Glass
____________
 Vehicle
 Light Concentration

Answer 3

CONVEX MIRROR:
CONCAVE MIRROR:

Question 4

Image Distance
o All virtual images have _________ distances
o All real images have _________ image distances

Answer 4

negative
positive

Question 5

 “If the reflecting surface lies on the inside of the curve, is a __________”
 Rules:
o Rays parallel to the principle axis are reflected towards
the __________ of the mirror.
o A ray passing through the _____ of curvature retraces
its path
o A ray passing through the principal focus, after
reflection is rendered parallel to the ___________.
o A ray of light which strikes the mirror at its pole gets
______ according to the law of reflection.
 Image formation in Concave Mirror:
o CASE 1:
When the object is placed at the center of curvature, the
image is of_______________ and is at the
center.
o CASE 2:
When the object is placed after the centre of curvature,
it is seen that the image is ___________ in shape
and lies between the ____________.
o CASE 3
When the object is placed within the focus of the mirror
it is seen that image is _____________ in
shape and lies ______ the mirror.
o CASE 4:
When the object is between the centre of curvature and
focus,it is seen that image is _____________
and lies _______ the centre of curvature.

Answer 5

concave mirror.

principle focus

centre

principal axis.

reflected

same size, real and inverted

real, inverted, small, centre C and focus F

virtual, erect and enlarged, behind

real, inverted and enlarged

outside

Question 6

 “If the reflecting surface lies on the outside of the curve, is a “_________”.
 Rules:
o A ray of light traveling parallel the principal axis after
reflection from a convex mirror appears to come from its
focus ______ the mirror
o A ray of light traveling towards the centre of curvature
behind the mirror and is ________ back its own path.
 Image formation in convex Mirror:
o The object is placed anywhere in front of the convex
mirror.
o The ray parallel to the principal axis after reflection
appears to come from the focus F _______ the mirror.
o Another ray going towards the centre of curvature C
behind the mirror gets ________ by the same path.
o The two reflected rays appear to intersect at a point
between _____________ the mirror.
o The image appears to be ___________.
o So the image formed by the convex mirror is ________________ with respect to object.

Answer 6

convex mirror
behind
reflected

behind
reflected
F and P behind
formed behind the mirror
virtual,
erect and smaller in size