Spherical Mirrors. Unlike in a convex mirror, the nature and size of the image in a concave mirror depends on the distance of the object from the mirror. Centre of curvature (C) is the centre of the sphere, of which the mirror is a part. i.  Concave mirrors Irrespective of the position of the object, a virtual, erect and diminished image is formed between F and P, behind the convex mirror. We can observe ourselves magnified when the mirror is placed close to our face. Object between F and P A virtual, erect and enlarged image is formed behind the concave mirror. Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis. Thus, as the object approaches the mirror, the image approaches the mirror too but not proportionately. Real images The images formed by convex mirrors are always diminished, virtual and erect, irrespective of the position of the object. The ratio of the height of the image in a spherical mirror, to the height of the object is called magnification (m) A real, inverted, highly enlarged image is formed at infinity, in front of the concave mirror. Used as reflectors for street light bulbs as it diverges light rays over a wide area. If the aperture of a convex mirror is small, then its focal length is equal to half its radius of curvature. Convex mirrors diverge the light incident on them and hence they are called the diverging mirrors. Object between C and F ii . Spherical mirrors can be further classified into the following two types as It is also installed behind automated teller machines as a security measure. A real, inverted, diminished image is formed between C and F, in front of the concave mirror. Convex mirrors. Appears to pass parallel to principal axis. an object is placed close to a concave mirror such that the distance between the mirror and the object is less than its focal length, then a magnified and virtual image is formed. Object beyond C Question 10 Write Sign conventions for reflection by spherical mirror? Concave mirrors converge the light incident on them and hence are called converging mirrors. Object at infinity 3)the upward distance perpendicular to principal axis is positive while downward distance are negative. 7)Focal Plane:A plane normal or perpendicular to principal axis and passing through principal focus of a spherical mirror. Spherical mirrors. Explain sign convention in mirror with the help of diagram. Concave Mirror:A spherical mirror whose reflecting surface is curved inwards ie faces towards the … An imaginary line passing through the centre of curvature and the pole of the mirror is called its principal axis. Spherical mirrors. The area of a convex mirror that is exposed to incident light is called the aperture. The image formed by a convex mirror is always erect, virtual, and diminished in size. Formation of Images by Spherical Mirrors Real images are those that can be caught on a screen while virtual images are those that cannot be caught on a screen. Sign conventions for reflection by spherical mirror. Virtual Images It is also installed behind automated teller machines as a security measure. Due to this property, concave mirrors are used in many applications. Rule 3: A light ray which first passes through the centre of curvature or appears to pass through the centre of curvature, after reflection, retraces its initial path. i. 4)Focal length and radius of curvature of concave mirror is taken as negative.

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