One such difference is the structure of convex lens is like, thicker at the centre and thinner at the edges. Difference between convex and concave mirror with comparison. The main difference between concave and convex mirrors is the most easily seen. In that lesson, it was shown that concave mirrors can produce both real and virtual images, depending upon the object location.
For plane mirrors, the object distance equals the image distance and all images are erect and virtual. Circular concave and parabolic mirrors compared caustic curves. For concave mirror, the reflected rays converge to the focal. Dec 08, 2018 eight important differences between convex and concave lens are compiled in the article in tabular form. The set includes a concave and a convex mirror with focal lengths of 10cm, 20cm, and 50cm. Concave mirrors are used as shaving mirrors, as reflectors in flashlights and automobile headlights, and by doctors e.
Same procedure as for concave mirrors we did earlier. 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. While plane mirrors always produce virtual images, concave mirrors are capable of producing both real and virtual images. 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. In this article, we will learn about image formation by concave and convex mirrors. A concave mirror is a mirror that is curved inward in the middle. These labs require very little setup and could be used in centers or stations.
This is a four page packet of practice problems that is divided into sections so as not to discourage students. Convex mirrors are used as rear view mirrors by drivers in vehicles and as reflectors in street lights. The detailed explaination about concave and convex mirrors is as follows. Conversely, the concave lenses are thinner at the centre and thicker at its edges, in structure. We look at the image formation by these spherical lenses using ray diagrams. Figure 1 shows the three types of mirrors we will consider. Light ray rules for convex lens and concave lens are discussed. It will give a virtual upright image if the object is within the focal length.
Instead of a flat piece of glass, imagine a large, round bowl. The terms concave and convex are from the perspective of the object. Replace the convex mirror with the concave one and move it to the end of the track. The formation of images by spherical mirrors imaging with convex mirrors ray 1 is initially parallel to the principal axis and appears to originate from the focal point. This packet includes practice problems for plane mirrors, convex mirrors, and concave mirrors. There will be a window having two buttons named concave mirror and convex mirror. In other subjects, you learn in lessons and do homework at home.
The physics convex lenses are converging lenses, and concave lenses are diverging lenses. A mirror that bulges outwards is called a convex mirror. Optics exam2 and problem solutions physics tutorials. The various lengths six lengths are relevant for mirrors. Concave mirrors are also known as a converging mirror since the rays converge after falling on the concave mirror while the convex mirrors are known as diverging mirrors as the rays diverge after falling on the convex mirror. The concaveconvex mirror set is perfect for student explorations of mirror optics. 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. Concave mirrors, geometrical optics from alevel physics tutor. If the inner side of the spherical mirror is reflecting, it is called a concave mirror. The focal length f of the concave mirror is 4 cm, therefore the patients teeth should be less than 4 cm in front of a concave mirror. You must be able to draw ray diagrams for plane mirrors, and be able to calculate image and object heights, distances, and magnifications. There is always a higher than usual level of risk associated with working in a science.
Theyre great additions to a study of light and optics. The primary goals are to understand the relationship between. All images formed from convex mirrors are erect, virtual, and diminished in size. Convex and concave lenses jonny nelson introduces an animated explanation of lenses a lens is a shaped piece of transparent glass or plastic that refracts light. Spherical mirrors a modern compter hovers between the obsolescent and the non existent sydney brenner. In this case, the focal point is behind the mirror. There are two types of curved mirror convex and concave.
Concave mirrors and convex mirrors image formation, ray diagram. A concave amkeup mirror is designed so that a person 28. To create a real image with a concave mirror, the object must be outside the focal point. Read about properties of convex mirror and concave mirror at. Concave mirrors are also called as convergence mirrors, because concave mirrors cause the incoming parallel rays together and it causes these rays to. This is a product that i created for my high school physics students. If the outside surface is polished, is it a convex mirror. The surface may be either convex bulging outward or concave bulging inward. Focal length of a concave mirror university of texas at. Convex mirrors are used as rear view mirrors in vehicles such as cars.
There are two kinds of spherical mirrors, concave and convex. Concave mirrors are silvered on the inside of the sphere and convex mirrors are silvered on the outside of the sphere. Difference between convex and concave mirror is one of the most important concepts in the topic of optics in physics. Concave mirrors can form inverted and real images and also virtual and erect images. Ray 2 heads towards the focal point, emerging parallel to the principal axis. Frankl your own mind is a sacred enclosure into which nothing harmful can enter except by your promotion. Geometrical optics in the study of how light behaves, it is. Concaveconvex mirror set of 6, 50mm arbor scientific. Looking at the outside of the bowl, you would see the surface curving away in all directions. The law of reflection applies, just as it does for a plane mirror, i. We now want to derive two simple equations which provide quantitative relationships among the quantities we have defined to describe mirrors, i. It explains about properties of different types of mir. The video in english explains about different types of mirror i. Difference between convex and concave lens with figure.
Curvedspherical mirror a curved mirror is a mirror with a curved reflecting surface. There are two types of spherical mirrors, convex mirror and concave mirror. You must understand the differences between these two kinds of mirrors, be able to draw. A virtual image is formed if the object is located less than one focal length from the concave. Concave and convex mirrors ray diagram for convex and. In a plane mirror the image is the same size as the object and the same way up. Ray hits the vertex of mirror 1 and reflects with same angle. Determine a the image distance b the magnification of image. So far we have discussed concave and convex mirrors qualitatively and graphically. It might help you to remember this if you think that when you look in a concave mirror, it looks like you are.
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. Since a concave mirror converges a parallel beams of light rays, it is also called converging mirror. Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. During shaving, the concave mirror forms an enlarged and erect image of the face when the mirror is held closer to the face. Lesson 3 focused on the reflection of light by concave mirrors and on the formation of images by this reflected light. All of them are segments of spheres centered on a horizontal axis.
The focal length of a convex mirror is 10 cm and the object distance is 20 cm. The purpose of this activity is to measure the focal length of a concave mirror. Applications and uses of concave mirror in daily life byjus. When parallel rays could be from a distant object incident on a concave mirror, the reflected rays converge to a focal point f, hence also called converging mirror. A convex mirror has a negative focal length because of this. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. How light is reflected from a concave mirror to produce real and virtual images. In lesson 4, we will follow a similar pattern of inquiry for convex mirrors. As shown above, real images are produced when the object is located a distance greater than one focal length from the mirror. In order for the tooth hole to be clearly visible by the doctor, the mirror used should be able to. The focal point f of a concave mirror is the point at which a parallel beam of light is focussed after reflection in the mirror. When these quantities are measured from the surface of the mirror or lens, the formula is. Concave and convex mirrors are examples of spherical mirrors.
Science plane, concave and convex mirrors and reflection. Three more labs to study plane, convex and concave mirrors. The focal point is the same distance from the mirror as in a concave mirror. The directions are written directly to the students so you dont have to introduce them. In case of convex mirror, parallel rays are diverged. If the object distance is greater than the focal length f then the concave mirror produces an inverted image.
Worksheets on concave and convex mirrors teachers pay teachers. This handson activity allows your students to discover the difference between reflections in concave and convex mirrors for themselves using spoons. It is proven in introductory physics textbooks1 that the image and. When parallel rays could be from a distant object incident on a concave mirror, the reflected rays converge to a focal point f, hence also called converging. This demo uses spoons to show students the difference between a reflections created by curved mirrors and how distance from the mirror changes the ref. Background concave and convex mirrors are examples of spherical mirrors. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. Worksheets on concave and convex mirrors teachers pay. The purpose of this lab is to introduce students to some of the properties of thin lenses and mirrors. Convex mirror has two ray diagrams because its principal focus and the centre of curvature lies behind its reflecting surface. Six different 50mm diameter spherical glass mirrors each feature a protected silver coating and is packed in a lined storage box. The minus sign indicates that the focal point of convex mirror is virtual. Analysis of the geometry in ray diagrams for spherical curved mirrors and thin concave and convex lenses give us a relationship between the position of the object s, the position of the image s, and the focal length f.
Draw rays or 1s 1f 1s convex implies f problems and solutions. For converging mirrors and diverging mirrors, the focal length is equal to onehalf the radius. A convex mirror can only produce a virtual image since all reflected rays will diverge. Ray 3 travels toward the center of curvature and reflects back on itself.
The two other most common types of mirrors are the ones you ask about. A concave mirror has a radius of curvature of 24 cm. The mirror formula using the real is positive sign convention. When parallel rays could be from a distant object incident on a concave mirror, the reflected. Therefore, not more than two positions of the object can be obtained in relation to these points unlike concave mirrors where more than two ray diagrams are constructed to find out the position of the image for different relative positions of the object. Snc 2d light and geometric optics convex mirrors extra practice worksheet a draw a ray diagram for each to locate the image. For physics, you have to learn at home through watching videos prepared by your physics teacher.
Jun 16, 2018 the video in english explains about different types of mirror i. Sign convention for spherical mirrors the sign conventions for the given quantities in the mirror equation and magnification equations are as follows. Concave mirrors are silvered on the inside of the sphere and convex mirrors are silvered on the. In convex mirrors, the principal axis is the same as in a plane or concave mirror, perpendicular to the center of the mirror. Ray, coming from first mirror turns back with same path after reflecting from second mirror. Eight important differences between convex and concave lens are compiled in the article in tabular form. The difference between concave and convex mirrors is also one of the most commonly asked questions in the physics exams and in the competitive exams. Concave mirrors are most commonly used in shaving because of its reflective and curved surface. While clicking on the concave mirror button, a concave mirror, object and its image will be displayed in the window.
Two concave mirrors are placed on same principal axis. Ask your doubt of concave mirror and get answer from subject experts and students on topperlearning. This lab could be done with the front and the back side of a spoon being used as a concave and a convex mirror. Concave mirrors, geometrical optics from alevel physics. The mirror used is a concave mirror or a convex mirror. The radius of curvature r, which is positive for concave mirrors and.
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