CONCAVE MIRROR SUBJECT-SCIENCE CLASS-X

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CONCAVE MIRROR SUBJECT-SCIENCE
CLASS-X

• PREPARED BY-
• SRADHANJALI PRADHAN
• CLASS - B.ED PART-II
• ROLL NO.- 20(SCIENCE)

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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

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CONCAVE MIRROR

• A concave mirror is that spherical mirror in
  which the reflection of light takes place at the
  concave surface

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PARTS OF CONCAVE MIRROR

• Centre of curvature (C)
• Radius of curvature (R)
• Pole (P)
• Principal Axis
• Principal Focus (F)

P
_____R___
lt
gt
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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

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• RULE-2
• A ray of light passing trough the centre of
  curvature of a concave mirror is reflected back
  along the same path

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• RULE-3
• A ray of light passing trough the focus of a
  concave mirror becomes parallel to the principal
  axis after reflection

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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

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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

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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

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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

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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

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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

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WHEN THE OBJECT IS AT INFINITY

• NATURE OF IMAGE
• at the focus
• real and inverted
• much smaller than the object (or highly
  diminished)

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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.

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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

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EVALUATE YOURSELF

• Q1)A ray of light which is parallel to the
  principal axis of a concave mirror ,after
  reflection
• passes through its focus
• is reflected back along the same path
• becomes parallel to the principal axis
• passes through the centre of curvature

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Q2) When the object is placed at centre of
curvature ,then image is formed

1. behind the mirror
2. between focus and centre of curvature
3. beyond centre of curvature
4. at centre of curvature

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Q3) When the object is placed at the focus of a
concave mirror, then image is formed

1. behind the mirror
2. at infinity
3. at the focus
4. beyond centre of curvature

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• TRY AGAIN

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• TRY AGAIN

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• TRY AGAIN

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GOOD. NEXT QUESTION
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GOOD. NEXT QUESTION
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THANK YOU