Feb 26, 2016 the last two parts included the use of convex and concave lens. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Convex lens and concave lens are two basic types of lenses. Converging and diverging lenses 3 2275 speedway, mail code c9000 austin, tx 78712 512 4715847 i. Convex lenses cause light to come together converge to a focal point.
Find convex and concave lenses lesson plans and teaching resources. A refracting telescope uses two convex lenses to magnify images in the sky. A lens with one convex and one concave side is convex concave or meniscus. So just remember, concave has the word cave in it so i always imagine that its kind of caving inwards caving inwards its a little bit of an exaggerated drawing but you get the general idea this is a concave lens right over here and let me draw its principal axis so this is its principal axis shouldnt curve at the beginning just redraw it. Thin lenses conclusion conclusion thin lenses are optical. They also enable millions of people to see clearly and read comfortably. One part was done when the lenses were in contact, two lenses placed on the same mount. Concave lenses cause light rays to spread out diverge. So remember, concave means it opens inward, like a cave. This 77 page pack is a great way to teach everything about light, starting with types of light, how light moves, how light can change direction, shadows, and the three types of objec. Simulation of image formation in concave and convex lenses. For the other part, convex lens was first mounted and then after locating the sharpest reduced image formed, the concave lens was placed in between and the final sharp image was located.
Crossgrade comparison of students conceptual understanding. Make sure you know the difference between the two main types of lenses by answering the questions on this worksheet and quiz. Study structure of the lens found in the human eye and determine whether it is concave or convex. The point where these three rays meet gives the location and size of the image. Concave and convex lenses can sometimes be used to cancel the effect of the other type of lens. Lens in a washer lab using convex and concave lens. If the lens is biconvex or plano convex, a collimated beam of light passing through the lens converges to a spot a focus behind the lens. A polygon is a plane shape bounded by a finite chain of straight lines. And think about how they transmit or refract light. It is this type of lens that is most commonly used in corrective lenses.
Most devices that control light have one or more lenses in them some use only mirrors, which can do most of the same things that lenses can do. In this lesson, youll learn about both concave and convex lenses. Fun interactive lab for california life science standard 7. Small concave lenses 1 per child if possible, sheet of white paper. Convex, converging lenses form real images and virtual images like concave mirrors.
Concave, diverging lenses only form virtual images, like convex mirrors. It will give a virtual upright image if the object is within the focal length. Lenses concave and convex apparatus selection of lenses, collimated light source, e. Convexconcave lenses lesson plan for 6th 9th grade. Place the convex and concave lenses together and place them in the path of the parallel rays. There are two types of curved mirror convex and concave. In this article, we will learn about image formation by concave and convex lenses. Lenses of many different types are used in optical devices such as cameras, eyeglasses, microscopes, telescopes, and projectors.
Teacher will initiate discussion to allow students to share their findings and observations. Move the point named focus to change the focal length. This convexconcave lenses lesson plan is suitable for 6th 9th grade. To find the focal point and focal length of convex and concave lens. When you look through a magnifying glass, or take a picture with a camera, you are using a lens. A convex lens gives a real, inverted image if the object is outside the focal length of the lens. Main next, the lesson focuses on two types of lenses, concave and convex. Again they are not for or on human animal use testing. May 26, 2014 a basic description of the differences between convex and concave lenses. If natural lenses deteriorate, extra lenses spectacles, contact lenses have to be added for obtaining a better vision. Convex lenses are also known as converging lens since the rays converge after falling on the convex lens while the concave lenses are known as diverging lenses as the rays diverge after falling on the concave lens. Difference between convex and concave lens with figure.
The lens which disperses the light rays around, that hits the lenses, are called a concave lens. Each surface may be convex, concave, or plane flat. Both concave and convex lenses are used in glasses. A basic description of the differences between convex and concave lenses. Convex lenses converge light that passes through them. Date qatar international school science department extension lesson ideas lenses lenses. Determining focal lengths of concave and convex lenses.
At manocha academy, learning science and math is easy. The lens which merges the light rays at a particular point, that travels through it, are a convex lens. The same sort of rules apply, just with a few modifications. We will find that the light gets scattered on the paper after passing through the concave lens. Convex lens converging lens concave lens diverging lens convex lens a convex lens is shaped like two half circles, thin at the edge and thick at the middle. Convex and concave lenses purpose in this experiment, you will explore the difference between convex and concave lenses and determine their focal lengths. Students will have fun learning about how convex and concave lens work.
Students see how both convex and concave lenses work, some of the different uses of both types of lenses and do an experiment showing how these lenses work. Images can be formed by lenses that divert light rays by refraction. See more ideas about teaching science, science activities and science lessons. Dec 08, 2018 the following points are noteworthy, so far as the difference between convex and concave lens is concerned. Hence lenses of such type are known as a diverging lens. Images formed by convex lenses same as the images formed by concave mirrors.
Lenses naturally occur in eyes and are a good example. Concave lenses focus distant objects so someone on the side of the lens opposite from which the incidence light is, sees the object as to be at a point behind the lens. Kids learn about lenses and light in the science of physics including concave, convex, converging, diverging, focal point, meniscus, and plano lenses. Lenses remembering the basics of mirrors puts you half ways towards fully understanding lenses as well. Prek and kindergarten primary elementary middle school secondary high school whole school special educational needs blog. How convex and concave lenses transmit, refract and reflect light, high school physics. The following points are noteworthy, so far as the difference between convex and concave lens is concerned. Try to create parallel beams of light using both lenses.
What i want to do now is talk about lenses, or talk about what a lens is. Resources resources home early years prek and kindergarten primary elementary middle school secondary high school whole school special educational. Image formation images can be formed by lenses that divert. Light, refraction, concave lens, convex lenses, refractive. A lens changes the direction of light waves by refraction. Concave lenses curve inward from the edges toward the center. What is the difference between concave and convex polygons. They should try to describe any images they form in terms of magnification, upright or inverted, real or virtual.
Teaching resources, primary resources, twinkl, primary school resources. Keep in mind that for an object to be considered a lens it must be made of a transparent material that has an index of refraction higher than air. A convex lens is converging and can produce virtual and real images. Demonstration of the optics of thin convex and concave lenses. If you are a company, school or university we also accept purchase orders. Level 5 explain how a camera lens works level 6 relate the shape of a lens to the type of glasses needed for long and shortsightedness.
If you buy a chemical and you are using it for clinical human animal use application we are not liable. Lenses all of us at some time or the other have seen or used lenses. Lenses are used in cameras, microscopes, binoculars and other optical equipment. What does this tell you about the relationship between the focal lengths of these two lenses. Light ray rules for convex lens and concave lens are discussed. Slide the convex and concave lenses apart to observe the effect of a combination of two lenses. A convex lenses refracts these parallel rays so that they are come together at a point called the principal. In this activity you will look at only two kinds of lenses, convex and concave, and observe their similarities and differences. A microscope, like a reflecting telescope, uses a concave mirror, a plane mirror, and a convex lens. Well explore how these types of lenses bend light to help people see things both near and far more clearly. There are two main shapes of lenses, convex and concave. Diagrams are clear and help get the key points across succinctly and accurately. Students are shown incident rays into a concave lens and then try to predict and draw the ray diagram for the refracted rays.
Ray 3 is drawn through the exact centre of the lens and does not refract. Mar 04, 2015 is an educational software that helps students develop flexible knowledge, effective problem solving skills, selfdirected learning, intrinsic motivation. Lenses ray diagram construction worksheet teaching resources. Move the tip of the object arrow to move the object. Theory when parallel light rays pass through a thin lens, they emerge either converging or diverging. One of the first grade standards addresses light waves and how they move. Convex converging and concave diverging lenses are drawn as. Date qatar international school science department. A lens is a piece of transparent material typically with at least one curved surface, which refracts, or bends, light rays coming from an object. Concave lenses video geometric optics khan academy. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. These lenses focus the rays of light to produce a apart centre concave converging eye focal focus inwards parallel real transparent virtual image that can be projected onto a screen. Convex lens screen purpose to determine the focal length of a thin lens and to explore the difference between convex and concave lenses and to determine their focal lengths. If we replace the convex lens with a concave lens in the above experiment of sunlight and paper.
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