Image formed byconcave_mirror-

WELCOME
CONCAVE MIRROR
CONTENTS 
CONCAVE MIRROR 
PARTS OF CONCAVE MIRROR 
RULES FOR OBTAINING IMAGE 
FORMED BY CONCAVE MIRROR 
DIFFERENT TYPES OF IMAGES FORMED 
BY A CONCAVE MIRROR 
USES OF CONCAVE MIRRORS
CONCAVE MIRROR 
A concave mirror is that spherical mirror in 
which the reflection of light takes place at 
the concave surface
PARTS OF CONCAVE MIRROR 
 Centre of curvature (C) 
 Radius of curvature (R) 
 Pole (P) 
 Principal Axis 
 Principal Focus (F) 
P 
<_____R__>_
RULES FOR OBTAINING IMAGES FORMED 
BY A CONCAVE MIRROR 
RULE -1 
A ray of light which 
is parallel to the 
principal axis of a 
concave mirror , 
passes trough its 
focus after reflection 
from the mirror
Rule 2 
A ray of light passing 
trough the centre of 
curvature of a 
concave mirror is 
reflected back along 
the same path
Rule 3 
A ray of light passing 
trough the focus of a 
concave mirror 
becomes parallel to 
the principal axis after 
reflection
FORMATION OF DIFFERENT TYPES OF 
IMAGES BY A CONCAVE MIRROR 
Positions of the object : 
 between the pole (P) and focus (F) 
 At the focus (F) 
 between focus (F) and centre of curvature (C) 
 At the centre of curvature (C) 
 beyond the centre of curvature (C) 
 At infinity
WHEN THE OBJECT IS PLACE BETWEEN 
POLEAND FOCUS OF THE MIRROR 
(OBJECT BETWEEN P AND F) 
NATURE OF IMAGE 
 behind the mirror 
 Virtual and errect 
 larger than the 
object
WHEN THE OBJECT IS PLACED AT FOCUS OF 
A CONCAVE MIRROR (OBJECT AT F) 
NATURE OF IMAGE 
 at infinity 
 real and inverted 
 highly magnified 
or enlarged
WHEN THE OBJECT IS PLACED BETWEEN 
FOCUS AND CENTRE OF CURVATURE 
(OBJECT BETWEEN F AND C) 
NATURE OF IMAGE 
 beyond the centre of 
curvature 
 real and inverted 
 larger than the object
WHEN THE OBJECT IS PLACED AT THE 
CENTRE OF CURVATURE OF ACONCAVE 
MIRROR (OBJECT AT C) 
NATURE OF IMAGE 
 at the centre of 
curvature 
 real and inverted 
 same size as the 
object
WHEN THE OBJECT IS BEYOND THE CENTRE 
OF CURVATURE OF A CONCAVE MIRROR 
(OBJECT BEYOND C) 
NATURE OF IMAGE 
 between the focus 
and centre of 
curvature 
 real and inverted 
 smaller than the 
object
WHEN THE OBJECT IS AT INFINITY 
NATURE OF IMAGE 
 at the focus 
 real and inverted 
 much smaller than 
the object (or highly 
diminished)
USES OF CONCAVE MIRRORS 
Concave mirrors are used - 
 As reflectors in car head-lights 
,search lights ,hand 
torches ,and table lamps. 
 By doctors to concentrate 
light on body parts like 
ears and eyes. 
 In the field of solar 
energy to focus sun-rays 
on the objects to be 
heated. 
 As shaving mirrors.
SUMMARISATION 
So far we had discussed- 
Concave mirrors 
Parts of concave mirrors 
Different types of images formed by a 
concave mirror 
Uses of concave mirror
EVALUATE YOURSELF 
Q1)A ray of light which is parallel to the principal 
axis of a concave mirror ,after reflection 
a) passes through its focus 
b) is reflected back along the same path 
c) becomes parallel to the principal axis 
d) passes through the centre of curvature
Q2) When the object is placed at centre of 
curvature ,then image is formed 
a) behind the mirror 
b) between focus and centre of curvature 
c) beyond centre of curvature 
d) at centre of curvature
Q3) When the object is placed at the focus of 
a concave mirror, then image is formed 
a) behind the mirror 
b) at infinity 
c) at the focus 
d) beyond centre of curvature
THANK YOU
1 de 21

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Image formed byconcave_mirror-

  • 3. CONTENTS CONCAVE MIRROR PARTS OF CONCAVE MIRROR RULES FOR OBTAINING IMAGE FORMED BY CONCAVE MIRROR DIFFERENT TYPES OF IMAGES FORMED BY A CONCAVE MIRROR USES OF CONCAVE MIRRORS
  • 4. CONCAVE MIRROR A concave mirror is that spherical mirror in which the reflection of light takes place at the concave surface
  • 5. PARTS OF CONCAVE MIRROR  Centre of curvature (C)  Radius of curvature (R)  Pole (P)  Principal Axis  Principal Focus (F) P <_____R__>_
  • 6. RULES FOR OBTAINING IMAGES FORMED BY A CONCAVE MIRROR RULE -1 A ray of light which is parallel to the principal axis of a concave mirror , passes trough its focus after reflection from the mirror
  • 7. Rule 2 A ray of light passing trough the centre of curvature of a concave mirror is reflected back along the same path
  • 8. Rule 3 A ray of light passing trough the focus of a concave mirror becomes parallel to the principal axis after reflection
  • 9. FORMATION OF DIFFERENT TYPES OF IMAGES BY A CONCAVE MIRROR Positions of the object :  between the pole (P) and focus (F)  At the focus (F)  between focus (F) and centre of curvature (C)  At the centre of curvature (C)  beyond the centre of curvature (C)  At infinity
  • 10. WHEN THE OBJECT IS PLACE BETWEEN POLEAND FOCUS OF THE MIRROR (OBJECT BETWEEN P AND F) NATURE OF IMAGE  behind the mirror  Virtual and errect  larger than the object
  • 11. WHEN THE OBJECT IS PLACED AT FOCUS OF A CONCAVE MIRROR (OBJECT AT F) NATURE OF IMAGE  at infinity  real and inverted  highly magnified or enlarged
  • 12. WHEN THE OBJECT IS PLACED BETWEEN FOCUS AND CENTRE OF CURVATURE (OBJECT BETWEEN F AND C) NATURE OF IMAGE  beyond the centre of curvature  real and inverted  larger than the object
  • 13. WHEN THE OBJECT IS PLACED AT THE CENTRE OF CURVATURE OF ACONCAVE MIRROR (OBJECT AT C) NATURE OF IMAGE  at the centre of curvature  real and inverted  same size as the object
  • 14. WHEN THE OBJECT IS BEYOND THE CENTRE OF CURVATURE OF A CONCAVE MIRROR (OBJECT BEYOND C) NATURE OF IMAGE  between the focus and centre of curvature  real and inverted  smaller than the object
  • 15. WHEN THE OBJECT IS AT INFINITY NATURE OF IMAGE  at the focus  real and inverted  much smaller than the object (or highly diminished)
  • 16. USES OF CONCAVE MIRRORS Concave mirrors are used -  As reflectors in car head-lights ,search lights ,hand torches ,and table lamps.  By doctors to concentrate light on body parts like ears and eyes.  In the field of solar energy to focus sun-rays on the objects to be heated.  As shaving mirrors.
  • 17. SUMMARISATION So far we had discussed- Concave mirrors Parts of concave mirrors Different types of images formed by a concave mirror Uses of concave mirror
  • 18. EVALUATE YOURSELF Q1)A ray of light which is parallel to the principal axis of a concave mirror ,after reflection a) passes through its focus b) is reflected back along the same path c) becomes parallel to the principal axis d) passes through the centre of curvature
  • 19. Q2) When the object is placed at centre of curvature ,then image is formed a) behind the mirror b) between focus and centre of curvature c) beyond centre of curvature d) at centre of curvature
  • 20. Q3) When the object is placed at the focus of a concave mirror, then image is formed a) behind the mirror b) at infinity c) at the focus d) beyond centre of curvature