Convex mirrors diverge the light incident on them and hence they are called the diverging mirrors. to view a magnified view of the interior parts of the mouth are concave. The field of view for a convex mirror is greater than that for a plane mirror, the aperture being the same. Appears to pass parallel to principal axis. c. simple mirror . The Multiple Choice Questions Related i.e. The image formed by a convex mirror is always erect, virtual, and diminished in size. If the magnification of an image is positive it does mean that the image is virtual and erected. Courses. The reflected rays, when projected backwards, appear to meet at a point on the principal axis. Object beyond C All distances are measured from the pole of the mirror. Object between F and P 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. A real, inverted, enlarged image is formed beyond C, in front of the concave mirror. Centre of curvature (C) is the centre of the sphere, of which the mirror is a part. Question 2. Since the outer surface is a convex surface, the mirror so formed is called a convex mirror. Focal length (f) is the distance of the principal focus from the pole of the mirror. Huge concave mirrors are used to focus sunlight to produce heat in solar furnaces. Of these, the brightest image is the [RPMT 2003] The ratio of the height of the image in a spherical mirror, to the height of the object is called magnification (m). Spherical mirrors can be further classified into the following two types as d. none of the above Ans. 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. Ans : [CBSE 2014] Spherical mirror is a part of a sphere. Real images 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. ENT doctors use them for examining the internal parts of the ear, nose and throat. The location of the object does not affect the characteristics of the image. Our mission is to provide a free, world-class education to anyone, anywhere. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Principal axis is the line joining the pole and the centre of curvature. Real images are those that can be caught on a screen while virtual images are those that cannot be caught on a screen. Questions pertaining to spherical mirrors. Plane mirrors ii. Due to this property, concave mirrors are used in many applications. It is also installed behind automated teller machines as a security measure. What is reflection? Email This BlogThis! The images formed by the mirrors are of two types they are B. Irrespective of the position of the object, a virtual, erect and diminished image is formed between F and P, behind the convex mirror. Selina solutions for Concise Physics Class 8 ICSE chapter 6 (Heat Transfer) include all questions with solution and detail explanation. ii. 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. Summary. Search for courses, skills, and videos. The length along the principal axis from the pole to the principal focus is called the focal length of the concave mirror. Generally we can classify the mirrors into the following two types as i. Hence, convex mirrors are used as rear-view mirrors in vehicles. Hence, convex mirrors are used as rear-view mirrors in vehicles. Radius of curvature (R) is the radius of the sphere, of which the mirror is a part. Search. If the magnification is equal to 1 The image formed is equal to the object in size. The distance from the principal focus to the pole of the mirror is the focal length of the mirror and is equal to half the radius of curvature, which is the distance between the centre of curvature and the pole. Spherical mirrors can be further classified into the following two types as. Question 3. Donate Login Sign up. Object at F The first mirrors used by humans were most likely pools of water. A virtual, erect and enlarged image is formed behind the concave mirror. Light Class 8 Extra Questions Short Answer Questions. The images formed by convex mirrors are always diminished, virtual and erect, irrespective of the position of the object. If the magnification of an image is negative it does mean that the image is real and inverted. Thus, the magnification produced by these mirrors is always less than one. References Mirrors are the basic means of viewing our own beauty. This will clear students doubts about any question and improve application skills while preparing for board exams. Reactions: No comments: Post a comment. Donate or volunteer today! Sign convention for Spherical Mirrors. Thus, the magnification produced by these mirrors is always less than one. The location of the object does not affect the characteristics of the image. They are used as reflectors in the headlights of vehicles, search lights and in torch lights to produce a strong parallel beam of light. A real, inverted, same sized image is formed at C, in front of the concave mirror. Thus, as the object approaches the mirror, the image approaches the mirror too but not proportionately. What is a mirror? question_answer8) A thick plane mirror shows a number of images of the filament of an electric bulb. The … As the object moves away from the mirror, the size of its image reduces along with its distance from the mirror. Distances measured along y-axis above the principal axis are taken as positive and that measured along y-axis below the principal axis are taken as negative. If the magnification is more than 1 The image formed is magnified in size. We love to hear your thoughts about this post! Object at C Object between C and F Concave mirrors converge the light incident on them and hence are called converging mirrors. Activities. 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. For a real image object distance (u) and the image distance (v) are negative and the magnification is negative. Concave Mirror Question 1. This point is called the principal focus. Depending on the position of the object in front of the concave mirror, the position, size and the nature of the image varies. 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. Since the inner surface is a concave surface, the mirror so formed is called a concave mirror. Labels: class10-physics, class10-science, class12-Physics, class8-science. 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. This is why, the rear view mirrors of the cars and bikes are made of convex mirrors. The image formed by a convex mirror is always erect, virtual, and diminished in size. Answer: The bouncing back of light into the same medium after it falls on a surface is called reflection.
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