Physics mcqs for class 12 with answers chapter 9 ray. Optics ray diagramstired of searching through the internet for a complete lens and mirror ray diagram teaching resource. The ray diagram above illustrates that the image of an object in front of a double concave lens will be located at a position behind the double concave lens. Shows how to draw the ray diagrams for locating the image produced by a concave lens and a convex mirror. Concave lens ray diagram, images formed with steps. The image is always formed inside the focal length of the lens. Move the point named focus to the right side of the lens to change to a concave lens. This point is called the principal focus of the concave mirror. Ray diagram helps us to study the nature, position and relative size of the image formed by lenses.
Physics mcqs for class 12 with answers chapter 9 ray optics. 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. In this case image will form between f and 2f,image will be real,inverted,smaller than the object. Image formation by convex and concave lens ray diagrams. Class 10 science chapter 10 light reflection and refraction. Ray 3 passes straight through the center of the lens. 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. Mar 03, 2019 convex and concave lenses are spherical lenses.
The method for drawing ray diagrams for concave mirror is described below. Concave mirrors and convex mirrors image formation, ray. The following diagrams show the ray diagram for a concave lens. A ray diagram is a tool used to determine the location, size, orientation, and type of image formed by a lens. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. They come together at a point called the principal focus. When a ray, parallel to principal axis strikes concave or convex lenses, the reflected ray passes through a focus on the principle axis. Feedback greatly received particularly constructive ways to improve. In every problem, draw a ray diagram to confirm your answer. Focal point and focal length ray diagram for lenses.
Images through lenses as real, virtual, erect or magnified definition figure shows the virtual image formed by convex lens and real image formed by concave lens. Concave mirrors extra practice worksheet a draw a ray diagram for each to locate the image. A spherical concave lens has a focal length of 20 cm and an object is placed 10 cm from the lens. Such lenses diverge light rays as shown in figure 1b such lenses are called diverging lenses. When the upper half of the lens is covered by an opaque. A mirror is a part of a smooth and highly polished reflecting surface. Concave spherical mirrors and ray diagrams r r, from the. Dec 08, 2018 based on the shape, the lens can be grouped as a convex lens or concave lens.
Concave and convex mirrors ray diagram for convex and. Concave mirrors and convex mirrors image formation, ray diagram. Images formed by concave mirror using ray diagram last updated on march 20, 2019 by mrs shilpi nagpal 19 comments question 1 the image formed by concave mirror is seen to be virtual,erect and larger than the object. Move the point named focus to change the focal length. A mirror is a surface which reflects a clear image. Concave lens and ray diagrams examples, solutions, videos. Ray diagram for diverging lenses, use the same rules, just the focal lengths are reversed. To understand ray diagrams it is important to know something. Ray diagram practice concave mirrors worksheets kiddy math.
Where is the final image as shown, two converging lenses, each with a focal length of 10cm, are separated by 50cm. Draw a ray diagram showing the path of rays of light when it enters. All four types of concave lens are diverging lenses. Concave and convex lenses image formation curvature. Snc 2d light and geometric optics concave mirrors extra practice worksheet a draw a ray diagram for each to locate the image. This is the type of information that we wish to obtain from a. You can see a listing of all my videos at my website. Nature of images by a convex and concave lenses with ray. As a result, temperature at its focus increases and the substance placed at the focal point gets heated to a high temperature. A ray parallel to the lens axis passes through the far focus of a converging lens or appears to come from the near focus of a diverging lens. Diagram below shows several incident rays emanating from an object each incident ray will refract through the lens the refracted rays are intersecting is. Ray diagram for image formation by lenses is shown in the attached figure.
It will give a virtual upright image if the object is within the focal length. 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. Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. When the upper half of the lens is covered by an opaque screen. Move the tip of the object arrow to move the object. Use lens equation to find the final image m i 2o i 2i 1 i 1o m 1 x m 2. A lens, whether it is a convex lens or a concave lens, has two spherical surfaces which form a part of a sphere. The focal length of a convex lens is positive, while that of a concave lens is negative. Just as in the case of a converging lens, we can construct a ray diagram to locate the image produced by a diverging lens, as shown in figure 7. For drawing ray diagrams we first consider how light rays falling on both concave and convex lens in three different ways get refracted. It can be convex outside surface of a sphere or concave inside surface.
On the contrary, the image formed by the concave lens is erect, virtual and smaller, than the object. In other words, the edges of the lens are thicker than the middle. At what distance from the lens a 5 cm tall object be. Concave lenses, though, serve an important role as well. Furthermore, the image will be upright, reduced in size smaller than the object, and virtual. Light ray rules for convex lens and concave lens are discussed. The method of drawing ray diagrams for double convex lens is described below. Describe the properties of an image produced by a concave lens.
Lenses lenses are made of transparentmaterials, like glass or plastic. Read from lesson 5 of the refraction and lenses chapter at the physics classroom. If the path of several light rays through a lens is traced, each of these light rays will intersect at a point upon refraction through the lens. Ray tracing diagram for concave lens physics diagrams. The former brings together the parallel beam of light, while the latter disperses it. Ray diagram practice concave mirrors some of the worksheets for this concept are ray diagrams for concave mirrors, converging diverging lenses ray diagrams, mirror ray diagram work answers, ray diagrams, ray diagrams for convex mirrors, physics, 1 1 1 h d i i in every problem draw a ray i o f h d o o, diverging converging lens work. Images formed by concave mirror using ray diagram class. A spherical concave lens has a focal length of 20 cm and. Based on the shape, the lens can be grouped as a convex lens or concave lens.
Concave lens ray diagrams for light and optics part 5. The lateral magnification of the mirror or lens is the ratio. Draw the ray diagram in each case to show the position and nature of the image formed. A concave lens is a lens that is thinner at the centre than it is at the edges, i. For a convex lens, we draw the ray diagram as follows. Concave lenses, geometrical optics from alevel physics. Shows how to draw ray diagrams to locate the image formed by a convex lens. Ray 2 heads towards f before refracting parallel to the axis. You get a full set of notes for each device, several sets ex. Nov 18, 2012 concave lens ray diagrams for light and optics part 5. Students will read a sentence and decide if it is describing a concave or convex lense, then glue the box in the correct column.
The main difference between concave and convex lens is that a concave lens is thinner at the centre than it is at the edges, whereas a convex lens is thicker at the centre than it is at the edges. Ray diagram for a concave lens figure below shows how light rays are focused by a concave lens. Use the image created from the first lens as the object for the second lens. They are all meetingintersecting at a point on the principal axis of the mirror. To understand ray diagrams it is important to know something about images. Ray diagrams for double convex lenses were drawn in a previous part of lesson 5. A spherical concave lens has a focal length of 20 cm and an. Wikipedia the example ray tracing diagram for concave lens was created using the conceptdraw pro diagramming and vector drawing software extended with the physics solution from the science and education area of conceptdraw solution park. This is a fun and engaging way to practice determining the differences between concave and convex lenses. Concave lens ray diagrams for light and optics part 5 youtube. This can be substituted into the lens equation as follows. Where will an image form if an object is placed 58 cm from the mirror. A converging lens is used to form an image on a screen.
In this lesson, we will see a similar method for constructing ray diagrams for double concave lenses. Concave mirror convex mirror image formation by concave mirror concave mirror ray diagram image formation by convex mirror. The mirror has a radius r, and the distance from the mirror to the object is p. Describe with the help of a ray diagram the position, size and nature of the image formed by a concave lens when the object is placed at infinity. Jan 22, 2020 students can solve ncert class 12 physics ray optics and optical instruments mcqs pdf with answers to know their preparation level. A spherical mirror is a part of a spherical reflecting surface. A number of rays parallel to the principal axis are falling on a concave mirror. When a ray strikes concave or convex lenses obliquely at its pole, it continues to follow its path. Ray diagrams for diverging lenses the physics classroom. A worksheet to construct ray diagrams to show where images are formed by a converging convex lens and a diverging concave lens.
A concave lens bulges inward and is thinner in the middle and thicker at the edges. This resource contains everything you need for teaching convex and concave lenses and mirrors. With a concave lens, the image will always be diminished, the right way up and virtual. Ray diagrams are constructed by taking the path of three distinct rays from a point on the object. Object ray parallel to principal axis image ray pointing to a focal point f 2 object ray pointing to the center c image ray inline with the object ray. The description is applied to the task of drawing a ray diagram for an object.
The lens equation 7 example 1 what image is produced by placing an object6cmaway from a convex lens of focal length3cm. Images formed by concave mirror using ray diagram class 10. Convex and concave lenses lenses and ray diagrams ocr. Guidelines for rays falling on the concave and convex lenses. Give differences between a concave lens and convex lens. So, the point of focus in case of the convex lens is the point where all the light rays meet, i.
Concave spherical mirrors and ray diagrams a spherical mirror is a reflective segment of a sphere with a radius of curvature r. Convex mirror is a curved mirror for which the reflective surface bulges out towards the. Although may also be useful for other boardsalevel answer sheet available. Mar 09, 2018 concave mirror has the property to concentrate the sunlight coming from sun along with heat radiation at its focus. In a ray diagram, a convex lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens. The ray diagrams for concave lenses inside and outside the focal point give similar results. Each of a lens two faces is part of asphere and can be convex or concave if a lens is thicker at the center than theedges, it is a convex, or converging, lenssince parallel rays will be converged tomeet at the focus. Yet the same method works for drawing a ray diagram for any object location. A convex lens is thicker in the middle than it is at the edges. Ray diagram for lenses if an image is formed, only two rays are necessary to determine the image point. Lenses ray diagram construction worksheet teaching.
Whenever a light ray hits the interface between two. For a concave lens,there are only 2 casesthey areobject is placed at infinityobject is placed between infinity and optical centercase 1 object is placed at infinityin this case, object is kept far away from mirror almost at infinite distanceso, we draw rays parallel to principal axissince ray pa. Mar 20, 2019 images formed by concave mirror using ray diagram last updated on march 20, 2019 by mrs shilpi nagpal 19 comments question 1 the image formed by concave mirror is seen to be virtual,erect and larger than the object. Concave lenses draw a ray diagram to show how an image is formed by a concave lens. A concave lens may be considered to be made up of two prisms and a solid glass block in the centre.
When an object is at infinity, a real image is formed at the focus point. This is the reason why a convex lens is called a converging lens. Ray optics and optical instruments class 12 physics mcqs pdf. 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. That is, they diverge parallel rays of light from a focus, producing a virtual image. Explain formation of different types of images by a concave lens. Difference between convex and concave lens with figure. To mathematically determine properties of the object. With this formal knowledge, students will recreate both the convex and concave lens setups followed up by a separate lens setup to represent the anatomyphysiology of the human eye. Although, may also be useful for other boardsalevel. Ray diagrams 4 of 4 concave lens and convex mirror youtube.
If the object is 12 cm tall, what will be the height of the image. Converging lenses ray diagrams the physics classroom. A concave lens is any lens that has an inward curve in the middle. We look at the image formation by these spherical lenses using ray diagrams. Lenses ray diagram construction worksheet teaching resources. The ray passing through the focal point becomes parallel to the principal axis after refraction by the lens.