CONCAVE MIRRORCONCAVE MIRROR SUBJECT-SCIENCE SUBJECT-SCIENCE CLASS-X CLASS-X

CONCAVE MIRRORCONCAVE MIRROR SUBJECT-SCIENCE SUBJECT-SCIENCE CLASS-X CLASS-X

PREPARED BY-PREPARED BY-

SRADHANJALI PRADHANSRADHANJALI PRADHAN

CLASS - B.ED PART-IICLASS - B.ED PART-II

ROLL NO.- 20(SCIENCE)ROLL NO.- 20(SCIENCE)

PREPARED BY-PREPARED BY-

SRADHANJALI PRADHANSRADHANJALI PRADHAN

CLASS - B.ED PART-IICLASS - B.ED PART-II

ROLL NO.- 20(SCIENCE)ROLL NO.- 20(SCIENCE)

CONTENTSCONTENTS

CONCAVE MIRRORCONCAVE MIRROR

PARTS OF CONCAVE MIRRORPARTS OF CONCAVE MIRROR

RULES FOR OBTAINING IMAGE RULES FOR OBTAINING IMAGE FORMED BY CONCAVE MIRRORFORMED BY CONCAVE MIRROR

DIFFERENT TYPES OF IMAGES FORMED DIFFERENT TYPES OF IMAGES FORMED BY A CONCAVE MIRRORBY A CONCAVE MIRROR

USES OF CONCAVE MIRRORSUSES OF CONCAVE MIRRORS

CONCAVE MIRRORCONCAVE MIRROR

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

PARTS OF CONCAVE MIRRORPARTS OF CONCAVE MIRROR

Centre of curvature Centre of curvature (C)(C)

Radius of curvature Radius of curvature (R)(R)

Pole (P)Pole (P) Principal Axis Principal Axis Principal Focus (F)Principal Focus (F) P

_____R___< >

RULES FOR OBTAINING IMAGES FORMED RULES FOR OBTAINING IMAGES FORMED BY A CONCAVE MIRRORBY A CONCAVE MIRROR

RULE -1RULE -1

A ray of light which A ray of light which is parallel to the is parallel to the principal axis of a principal axis of a concave mirror , concave mirror , passes trough its passes trough its focus after focus after reflection from the reflection from the mirrormirror

RULE-2RULE-2

A ray of light A ray of light passing trough the passing trough the centre of curvature centre of curvature of a concave mirror of a concave mirror is reflected back is reflected back along the same along the same pathpath

RULE-3RULE-3

A ray of light A ray of light passing trough the passing trough the focus of a concave focus of a concave mirror becomes mirror becomes parallel to the parallel to the principal axis after principal axis after reflectionreflection

FORMATION OF DIFFERENT TYPES OF FORMATION OF DIFFERENT TYPES OF IMAGES BY A CONCAVE MIRRORIMAGES BY A CONCAVE MIRROR

Positions of the object Positions of the object :: between the pole (P) and focus (F)between the pole (P) and focus (F) At the focus (F)At the focus (F) between focus (F) and centre of curvature (C) between focus (F) and centre of curvature (C) At the centre of curvature (C) At the centre of curvature (C) beyond the centre of curvature (C)beyond the centre of curvature (C) At infinityAt infinity

WHEN THE OBJECT IS PLACE BETWEEN WHEN THE OBJECT IS PLACE BETWEEN POLEAND FOCUS OF THE MIRROR POLEAND FOCUS OF THE MIRROR (OBJECT BETWEEN P AND F)(OBJECT BETWEEN P AND F)

NATURE OF IMAGENATURE OF IMAGE behind the mirrorbehind the mirror Virtual and errectVirtual and errect larger than the larger than the

objectobject

WHEN THE OBJECT IS PLACED AT FOCUS OF WHEN THE OBJECT IS PLACED AT FOCUS OF A CONCAVE MIRROR (OBJECT AT F)A CONCAVE MIRROR (OBJECT AT F)

NATURE OF IMAGENATURE OF IMAGE at infinityat infinity real and invertedreal and inverted highly magnified highly magnified

or enlargedor enlarged

WHEN THE OBJECT IS PLACED BETWEEN WHEN THE OBJECT IS PLACED BETWEEN FOCUS AND CENTRE OF CURVATURE FOCUS AND CENTRE OF CURVATURE

(OBJECT BETWEEN F AND C)(OBJECT BETWEEN F AND C)

NATURE OF IMAGENATURE OF IMAGE beyond the centre beyond the centre

of curvatureof curvature real and invertedreal and inverted larger than the larger than the

objectobject

WHEN THE OBJECT IS PLACED AT THE WHEN THE OBJECT IS PLACED AT THE CENTRE OF CURVATURE OF ACONCAVE CENTRE OF CURVATURE OF ACONCAVE

MIRROR (OBJECT AT C)MIRROR (OBJECT AT C)

NATURE OF IMAGENATURE OF IMAGE at the centre of at the centre of

curvaturecurvature real and invertedreal and inverted same size as the same size as the

objectobject

WHEN THE OBJECT IS BEYOND THE CENTRE WHEN THE OBJECT IS BEYOND THE CENTRE OF CURVATURE OF A CONCAVE MIRROR OF CURVATURE OF A CONCAVE MIRROR

(OBJECT BEYOND C)(OBJECT BEYOND C)

NATURE OF IMAGENATURE OF IMAGE between the focus between the focus

and centre of and centre of curvature curvature

real and invertedreal and inverted smaller than the smaller than the

objectobject

WHEN THE OBJECT IS AT INFINITYWHEN THE OBJECT IS AT INFINITY

NATURE OF IMAGENATURE OF IMAGE at the focusat the focus real and inverted real and inverted much smaller than much smaller than

the object (or the object (or highly diminished)highly diminished)

USES OF CONCAVE USES OF CONCAVE MIRRORSMIRRORS

Concave mirrors are used -Concave mirrors are used - As reflectors in car head-As reflectors in car head-

lights ,search lights ,hand lights ,search lights ,hand torches ,and table lamps.torches ,and table lamps.

By doctors to concentrate By doctors to concentrate light on body parts like light on body parts like ears and eyes.ears and eyes.

In the field of solar In the field of solar energy to focus sun- energy to focus sun- rays on the objects to be rays on the objects to be heated.heated.

As shaving mirrors.As shaving mirrors.

SUMMARISATIONSUMMARISATION

So far we had discussed-So far we had discussed-Concave mirrorsConcave mirrorsParts of concave mirrorsParts of concave mirrorsDifferent types of images formed Different types of images formed

by a concave mirrorby a concave mirrorUses of concave mirrorUses of concave mirror

EVALUATE YOURSELFEVALUATE YOURSELF

Q1)A ray of light which is parallel to the principal Q1)A ray of light which is parallel to the principal axis of a concave mirror ,after reflectionaxis of a concave mirror ,after reflection

a)a) passes through its focuspasses through its focus

b)b) is reflected back along the same path is reflected back along the same path

c)c) becomes parallel to the principal axisbecomes parallel to the principal axis

d)d) passes through the centre of curvature passes through the centre of curvature

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

a)a) behind the mirrorbehind the mirror

b)b) between focus and centre of curvaturebetween focus and centre of curvature

c)c) beyond centre of curvaturebeyond centre of curvature

d)d) at centre of curvatureat centre of curvature

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

a)a) behind the mirrorbehind the mirror

b)b) at infinity at infinity

c)c) at the focusat the focus

d)d) beyond centre of curvaturebeyond centre of curvature

TRY AGAINTRY AGAIN

TRY AGAINTRY AGAIN

TRY AGAINTRY AGAIN

GOOD. NEXT QUESTIONGOOD. NEXT QUESTION

GOOD. NEXT QUESTIONGOOD. NEXT QUESTION

THANK YOU