Curved mirrorsCurved mirrors

CURVED MIRRORSCURVED MIRRORS

• A curved mirror is a mirror with a curved A curved mirror is a mirror with a curved reflective surface, which may be either reflective surface, which may be either bulging outward or bulging inward.bulging outward or bulging inward.

• Most curved mirrors have surfaces that Most curved mirrors have surfaces that are shaped like part of a sphere.are shaped like part of a sphere.

• But other shapes are sometimes used in But other shapes are sometimes used in optical devices, the most common non-optical devices, the most common non-spherical type are parabolic reflectorsspherical type are parabolic reflectors

Types of mirrorsTypes of mirrors

• Curved mirrors are broadly divided into 2 types:

i. Convex mirrors : the mirrors which are bulged out wards.

ii.Concave mirrors : the mirror which is bulged inwards.

o Convex mirrors Convex mirrors • A convex mirror, fish eye mirror or diverging

mirror, is a curved mirror in which the reflective surface bulges toward the light source.

• Convex mirrors reflect light outwards, therefore they are not used to focus light.

• Such mirrors always form a virtual image, since the focus (F) and the centre of curvature (2F) are both imaginary points "inside" the mirror, which cannot be reached.

• Thus the image cannot be caught on a screen• These mirrors are “diverging”.

Uses of convex mirrorUses of convex mirror

• Passenger-side mirror on a car is typically convex mirror.

• They provide a wider field of view as they are curved outwards.

• These mirrors are often found in the hallway of various buildings commonly known as “hallway safety mirrors.

• Convex mirrors are used in some automated teller machines as a simple and handy security feature, allowing the users to see what is happening behind them.

Image formation in convex mirror

• Object position : between F and 2F• Image position : between f and mirror• Nature of image : virtual, upright and

smaller

Concave MirrorConcave Mirror

• A concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light).

• Concave mirrors reflect light inward to one focal point.

• They are used to focus light.• Unlike convex mirrors, concave mirrors show

different image types depending on the distance between the object and the mirror.

• These mirrors are called "converging"

Uses of Concave mirrorsUses of Concave mirrors

• Concave mirrors are used in some telescopes.

• They are also used to provide a magnified image of the face for applying make-up or shaving.

• They are used by the dentists to see larger image of the patients teeth.

• It is used to see larger size of the image..

Image formation in concave mirror

• Object position : between focal point and mirror• Image position : at 2F• Nature of image : Virtual, Upright and magnified

• Object position : object at focal point • Image position : at infinity• Nature of image : either real or virtual,

uprigt or inverted

• Object position : between focus and centre of curvature

• Image position : real, inverted and magnified

• Nature of image : Beyond 2F

• Object position : Object at centre of curvature

• Image position : Image at centre of curvature

• Nature of image : Real, inverted and magnifieed

• Object position : Object beyond centre of curvature

• Image position : at infinity• Nature of image : either real or virtual,

uprigt or inverted

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Done byP.DhanushTenth ckassNarayana e-techno