Draw what you see in your notebook and label each picture with the type of lens with which you observed the object. Look through the lenses at the pages of a book, your hands, a hair, and other things. Look closely at the lenses and answer these questions in your notebook:Ģ. The lens in the human eye is thicker in the centre, and therefore it is a convex lensġ. The curved surface of the lens is called a meniscus. The lens which is thicker at the centre than at the edges is called a convex lens while the one which is thinner at its centre is known as a concave lens. Types of lenses and their characteristicsĪ lens is a piece of glass with one or two curved surfaces. Different lenses give various natures of images depending on their characteristics. Just curved mirrors change images, certain transparent medium called lens alter what you see through them.Ī lens is a transparent medium (usually glass) bound by one or two curved surfaces. Discuss with your neighbor on what is observed.ī) Look through an open window and discuss with your neighbor about the observations.Ĭ) Compare the observations in part (a) and (b) above.ĭ) Look through the lenses and describe the nature of image formed. Image formation through a mirror.Discovery activityĪ) Look through a plain glass window and observe what happens. Look at yourself in a flat mirror and choose one of the following that identifies your observation Ī) my image is clearly seen without changes.Ī) What do you think about formation of your image by the mirror?ī) What are the characteristics of this image formed? * describe the daily applications of lenses * explain the defects of lenses and how they can be corrected * construct the ray diagrams for formation of images by lenses * explain the phenomenon of refraction of light by lenses * differentiate between lenses and curved mirrors * state the types of lenses and explain their properties ![]() * explain physical features of thin lenses By the end of this unit, the learner should be able to explain the properties of lenses and image formation by lenses.īy the end of this unit, I will be able to:
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