Each mirror has a radius of curvature r which is in. To create a real image with a concave mirror, the object must be outside the focal point. Included extensions greatly benefit learners, so take advantage of the. Applications and uses of concave and convex mirrors teachoo. The sidebyside drawings comparing ray diagrams for mirrors vs. Oct 23, 2019 let us find out what are mirror and lenses, phenomenas associated with them, applications, convex lens, concave lens, convex mirror, concave mirror in the form of mcqs. Concave and convex both are used as an adjective to denote an. The concave mirrors, curved as the inside of a bowl, are used for focusing light, and the images often appear larger and upside down to the original object. If the object distance is greater than the focal length f then the concave mirror produces an inverted image. Ray 3 travels toward the center of curvature and reflects back on itself.
Convex mirrors are useful because by demagnifying they squeeze a lot of the world into a small image, so they allow us to look in lots of directions at once. Concave mirrors and convex mirrors image formation, ray. One mark questions convex mirror for seeing traffic at the. A mirror that bulges outwards is called a convex mirror. Concave and convex mirror terminology c f p principal axis reflect on the terminology used when f referring to concave and convex mirrors and the images they form. While clicking on the concave mirror button, a concave mirror, object and its image will be displayed in the window. Place the less curvy convex mirror the concave mirror in reverse about 10cm from the front of the light box and align it so that the central ray reflects back on itself. Cbse 2011 we require minimum two rays for locating the image formed by a concave 27. Draw a ray diagram to show the formation of a virtual image by a concave mirror. The principal focus of a convex mirror is a point on its principal axis from which a beam of light rays, initially parallel to the axis, appears to diverge after being reflected from the convex mirror. This lab requires the teacher to create the lab supplies which can be. It explains why mirrors, not lenses, are used in todays large telescopes.
If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Mcqs on spherical mirrors for the subject physics is given with answers in this article for the reference of students and as well as teachers. One mark questions convex mirror for seeing traffic at. You must understand the differences between these two kinds of mirrors, be able to draw. Made by silvering the inner surface of a part of the hollow glass sphere. All images formed from convex mirrors are erect, virtual, and diminished in size. They should try to describe any images they form in terms of magnification, upright or inverted, real or virtual. The focal length of a convex mirror is 10 cm and the object distance is 20 cm. In a plane mirror the image is the same size as the object and the same way up. There are two types of curved mirror convex and concave. A concave mirror has a radius of curvature of 24 cm. Mar 03, 2019 convex and concave lenses are spherical lenses.
Reflect on the terminology used when referring to concave and convex mirrors and the images they form. Concave mirror problems and solutions solved problems. Lets explore the ray tracing technique to figure out the properties of images when things are kept in front of a concave or a convex mirror. Curved mirrors concave and convex linkedin slideshare. In a concave mirror reflection of light takes place at the concave surface or bentin surface as shown below in the figure. You must be able to draw ray diagrams for plane mirrors, and be able to calculate image and object heights, distances, and magnifications. There will be a window having two buttons named concave mirror and convex mirror. Examine the diagram label the diagram with the terminology. The terms are used as adjectives to describe the types of lens, mirrors, polygons, etc. Dec 08, 2018 the focal length of a convex lens is positive, while that of a concave lens is negative.
Generally, a convex lens forms a real image, but it can also create a virtual image when the object is in the middle of the focus and optical centre. Fun interactive lab for california life science standard 7. The purpose of this activity is to measure the focal length of a concave mirror. A convex mirror can only produce a virtual image since all reflected rays will diverge. The main difference between concave and convex mirrors is the most easily seen. Difference between convex and concave lens with figure. The method for drawing ray diagrams for concave mirror is described below. We look at the image formation by these spherical lenses using ray diagrams. Students must then look back and make associations with image formation based upon type of mirror and the location of the object relative to. The focal length of a convex lens is positive, while that of a concave lens is negative. Concave mirrors are silvered on the inside of the sphere and convex mirrors are silvered on the outside of the sphere. The spherical mirrors are the mirrors with a curved reflecting surface. Image may be real or virtual depending on the position of the object.
Concave and convex mirrors worksheet teaching resources. Nov 15, 2017 on the contrary, in a concave mirror, the reflecting surface bulges inwards the main difference between a convex and concave mirror lies in the image formed by the two mirrors, i. Experiment 2a a position the light box on the edge of this paper. Convex mirror problems and solutions solved problems. In a convex mirror reflection of light takes place at the convex surface or bent out surface as shown below in the figure. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm. For plane mirrors, the object distance equals the image distance and all images are erect and virtual. Snc 2d light and geometric optics convex mirrors extra practice worksheet a draw a ray diagram for each to locate the image. If the outside surface is polished, is it a convex mirror.
Lets explore the ray tracing technique to figure out the properties. Concave mirrors can form inverted and real images and also virtual and erect images. The plane mirror is a flat surface, where the object. Concave and convex mirrors are examples of spherical mirrors. A concave shaving mirror has a focal length of 33 cm. Uses of convex mirrorswe saw that, image formed by convex mirrors isposition of the objectposition of the imagesize of the imagenature of the imageat infinityat the focus f,behind the mirrorhighly diminished,pointsizedvirtual and erectbetween infinityand the pole p ofthe mirrorbetween p and f,behin. Concave mirror convex mirror image formation by concave mirror concave mirror ray diagram image formation by convex mirror. For concave mirror, the reflected rays converge to the focal. The method is applied to the task of drawing a ray diagram for an object located beyond the center of curvature c of a concave mirror. Plane, concave and convex mirrors and reflection hindi duration. This worksheet tasks students with predicting and describing image formation off both convex and concave mirrors. Lenses concave and convex apparatus selection of lenses, collimated light source, e. All of them are segments of spheres centered on a horizontal axis. A mirror is a surface which reflects a clear image.
When parallel rays could be from a distant object incident on a concave mirror, the reflected. The plane mirror is a flat surface, where the object reflected has an image the same size. On the contrary, the image formed by the concave lens is erect, virtual and smaller, than the object. A ray passing through the focus of a concave mirror or proceeding toward the focus of a convex mirror is reflected parallel to mirror axis. To state the general rules of reflection of light off concave and convex mirror and to draw three sets of principal rays and their corresponding reflected rays for each mirror. The law of reflection applies, just as it does for a plane mirror, i. Concave mirrors and convex mirrors image formation, ray diagram. The focus of a convex mirror is situated behind the mirror. Lens in a washer lab using convex and concave lens. This professionally produced video takes a deeper dive into the differences between concave and convex mirrors and their use in optical instruments. Lenses refraction pdf books bellow will present you all associated to concave and convex mirrors. Determine a the image distance b the magnification of image.
Figure 3 illustrates how images are formed by a plane mirror and curved mirrors. Background concave and convex mirrors are examples of spherical mirrors. Concave and convex mirrors are commmonnly called as spherical mirrors, the spherical mirrors have the radius of curvature twice of the focal length i. Students must then look back and make associations with image formation based upon type of mirror and the location of the object relative to the center of curvature and focal length. The terms concave and convex are from the perspective of the object. The detailed explaination about concave and convex mirrors is as follows. Mcqs on spherical mirrors physics with answers the multiple choice questions related i. On the other hand, convex is used to describe an entity having an outline or surface that bulges out. Try to explain the terminology to your partner before looking at the definition cards. Ray 2 heads towards the focal point, emerging parallel to the principal axis. Difference between concave and convex concave vs convex. Discover concave and convex mirrors using a laser light.
Types of mirrors figure 1 shows the three types of mirrors we will consider. A real image is formed by the intersection of real light rays. A ray parallel to mirror axis passes through the focal point of a concave mirror or appears to come from the focal point of a convex mirror. Concave and convex mirror questions cyberphysics concave and convex mirror questions construct optical diagrams to answer these questions. Options are 40cm,20,60,30all in cm asked by priyanka th november 2017 9. Concave and convex mirrors ray diagram for convex and. A convex mirror has a wider range of view than a plane mirror, giving it many uses, especially relating to safety. A convex spherical mirror has the silvered surface of the mirror on the outer, or convex, side of the curve. Spherical mirrors can be thought of as a portion of a sphere which was sliced away and then silvered on one of the sides to form a reflecting surface. Oct 04, 2017 11 questions to test on basic understanding of images formed in convex and concave mirrors. Convex mirrors can be found indoors and out, on vehicles and in conjunction with security cameras. The minus sign indicates that the focal point of convex mirror is virtual. Concave and convex mirrors and lenses lesson 4 grade 8 science module 4, lesson 4 33 optical device u2022 lens u2022 convex lens u2022 converges u2022 focal point u2022 concave lens u2022 plano u2022 focal length filename.
Students will have fun learning about how convex and concave lens work. What is minimum number of rays required for locating the image formed by a concave mirror for an object. Imaging with convex mirrors ray 1 is initially parallel to the principal axis and appears to originate from the focal point. The surface may be either convex bulging outward or concave bulging inward. Scholars experiment with real and virtual images before reading a handout and completing homework questions. Science plane, concave and convex mirrors and reflection. Apr 23, 2020 uses of convex mirrorswe saw that, image formed by convex mirrors isposition of the objectposition of the imagesize of the imagenature of the imageat infinityat the focus f,behind the mirrorhighly diminished,pointsizedvirtual and erectbetween infinityand the pole p ofthe mirrorbetween p and f,behin.
Made by silvering the outer surface of a part of the hollow glass sphere. For converging mirrors and diverging mirrors, the focal length is equal to onehalf the radius. Concave parabolic b differences between a real and virtual image. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. This is why they show up in sideview mirrors on cars and in security mirrors on roads and in stores. An image which can be formed on the screen is known as real image and the one which cannot be formed on screen is known as a virtual image.
Difference between convex and concave mirror with comparison. Three types of mirrors are plane mirrors, concave mirrors and convex mirrors. Size can be smaller, larger or of the same size depending on the position of the object. A 10 mm long awl pin is placed vertically in front of a concave mirror. Focal length for concave mirror is taken as position and for convex lens is negative. Concave mirror problems and solutions solved problems in. Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. Differentiate between convex mirror and concave mirror.
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