CONCAVE MIRROR

CONCAVE MIRROR

VILESH V. L.PHYSICAL SCIENCEReg. No.: 13975035

VILESH V. L.PHYSICAL SCIENCEReg. No.: 13975035

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

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

NATURE OF IMAGE behind the

mirror Virtual and

erect larger than the object

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

NATURE OF IMAGE

at infinityreal and inverted

highly magnified or enlarged

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

THE OBJECT IS PLACED AT THE CENTRE OF CURVATURE OF ACONCAVE MIRROR (OBJECT AT C)

NATURE OF IMAGEat the centre of curvature

real and invertedsame size as the object

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 IMAGEat the focusreal and inverted much smaller than the object (or highly diminished)

USES OF CONCAVE MIRRORSConcave 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.

THANK YOU