The ratio of the height of the image in a spherical mirror, to the height of the object is called magnification (m) The reflected rays, when projected backwards, appear to meet at a point on the principal axis. This is why, the rear view mirrors of the cars and bikes are made of convex mirrors. 1)All distances are measured from pole of spherical mirror. This sign convention is known as New Cartesian Sign Convention. The images formed by the mirrors are of two types they are Introduction to Light – Reflection & Refraction. If the aperture of a convex mirror is small, then its focal length is equal to half its radius of curvature. The geometric centre of a concave mirror is called its pole. Thus, as the object approaches the mirror, the image approaches the mirror too but not proportionately. The distance from any point on the convex mirror to its centre of curvature is called the radius of curvature. On the other hand for a virtual image object distance (u) is negative and image distance (v) is positive and hence the magnification is positive, i.e., the image is erect. 5)Focal length and radius of curvature of convex mirror is taken as positive. Formation of Images by Spherical Mirrors A virtual, erect and enlarged image is formed behind the concave mirror. Your email address will not be published. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. If the magnification is less than 1 The image formed is diminished in size. She has started this educational website with the mindset of spreading Free Education to everyone. 2)Pole(P):The mid point of spherical mirror. Terms Associated with Spherical Mirrors. Due to this property, concave mirrors are used as shaving mirrors, and by dentists to view clearly the inner parts of the mouth. Thus, the magnification produced by these mirrors is always less than one. The reflecting surface of such mirrors can be considered to form a part of the surface of a sphere. Hence, convex mirrors are used as rear-view mirrors in vehicles. Concave Mirror Focal length (f) is the distance of the principal focus from the pole of the mirror. If the  magnification of an image is negative it does mean that the image is real and inverted. They are used as reflectors in the headlights of vehicles, search lights and in torch lights to produce a strong parallel beam of light. Virtual Images A real, inverted, diminished image is formed between C and F, in front of the concave mirror. Differences Between Convex Mirror and Concave Mirror. Thus, the magnification produced by these mirrors is always less than one. Required fields are marked *. i.  Concave mirrors The length along the principal axis from the pole to the principal focus is called the focal length of the concave mirror. The image formed by a convex mirror is always erect, virtual, and diminished in size. If a hollow sphere is cut into parts and the outer surface of the cut part is painted, … Class 10 Physics Light Reflection Refraction. If 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. It is also installed behind automated teller machines as a security measure. ii . Question 10 Write Sign conventions for reflection by spherical mirror? 3)Radius of curvature(R):The radius of hollow sphere of which the spherical mirror forms a part. Convex mirrors. If The speed of light in vaccvum is 3×10 8.find the absolute refractive index of a medium in which light travels with a speed of 1.5× 10 8. Sign conventions for reflection by spherical mirror. Hence, convex mirrors are used as rear-view mirrors in vehicles. Concave mirrors are used as shaving mirrors to see a larger image of the face. It is also installed behind automated teller machines as a security measure. We can observe ourselves magnified when the mirror is placed close to our face. Spherical Mirrors. The field of view for a convex mirror is greater than that for a plane mirror, the aperture being the same. This is why, the rear view mirrors of the cars and bikes are made of convex mirrors. Object beyond C Concave or Convex mirror thick or thin in the middle or edges. Last Updated on May 4, 2020 By Mrs Shilpi Nagpal 4 Comments. A concave mirror can be used as a shaving mirror, and by dentists to view clearly the inner parts of the mouth. to view a magnified view of the interior parts of the mouth are concave. Dentists use concave mirrors to view a magnified view of the interior parts of the mouth are concave. Real images are those that can be caught on a screen while virtual images are those that cannot be caught on a screen. Huge concave mirrors are used to focus sunlight to produce heat in solar furnaces. The image formed by a convex mirror is always erect, virtual, and diminished in size. Uses of Convex Mirrors, Object is always considered at the left of mirror. If the magnification is more than 1 The image formed is magnified in size. Pole (P) is the geometric centre of the spherical mirror. Since the inner surface is a concave surface, the mirror so formed is called a concave mirror. The area of a convex mirror that is exposed to incident light is called the aperture. It is also installed behind automated teller machines as a security measure. Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. It is also installed behind automated teller machines as a security measure. Principal axis is the line joining the pole and the centre of curvature. Radius of curvature (R) is the radius of the sphere, of which the mirror is a part. 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. The location of the object does not affect the characteristics of the image. 1)Concave Mirror:A spherical mirror whose reflecting surface is curved inwards ie faces towards the centre of sphere. The field of view for a convex mirror is greater than that for a plane mirror, the aperture being the same. The centre of the sphere from which concave mirror was cut is called the centre of curvature of the concave mirror, The distance from any point on the concave mirror to its centre of curvature is called the radius of curvature of the, An imaginary line passing through the centre of curvature and the pole of the concave mirror is called principal axis of the, The area of a concave mirror that is exposed to incident. Principal focus (F) is the point on the principal axis, where a parallel beam of light, parallel to the principal axis after reflection converges in the case of a concave mirror and appears to diverge from in the case of a convex mirror. Concave Mirror. Centre of curvature (C) is the centre of the sphere, of which the mirror is a part. Spherical mirrors are of two types 1. Concave Mirror:A spherical mirror whose reflecting surface is curved inwards ie faces towards the … In numericals, we need to calculate some things likeObject distanceImage distanceObject heightImage heightFocal lengthTo calculate them correctly, we need to find whether it is positive or negativeThe sign convention mentioned below helps us in itWe can see the …

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