# what is a lens class 10

Get notes for class 10 science Chapter 10 Light - Reflection and Refraction. A lens will be converging with positive focal length, and diverging if the focal length is negative. NCERT Class 10 Science Lab Manual – Image Formation by a Convex Lens Introduction > Lens: A transparent material bound by two surfaces, of which one or both surfaces are spherical, forms a lens. The power of a lens is defined as the reciprocal of its focal length. Terms related to lenses. Get detailed explanation to all concepts of light for class 10 only at BYJU'S. The lens is what focuses light from what you see through the viewfinder into a tiny, (typically) 35mm spot on the back of your film, DSLR, or mirrorless camera. It is represented by the letter P. The SI unit of power of a lens is ‘dioptre’. Learn about the difference between mirror and lens & its functions in a detailed way by visiting BYJU'S. Find detailed explanation to all concepts of light for class 10. Difference between mirror and lens and its application in the practical world are provided here. Convex lens: Convex lens is a transparent curved device that is used to refract light. Light is such an important source that … CBSE notes for class 10 science Chapter 10 Light - Reflection and Refraction. Class 10 Physics Light Reflection Refraction: Terms related to lenses. Each of these surfaces forms a part of a sphere. A lens is said to be thin if the gap between the two surfaces is very small. The centres of these spheres are called centres of curvature of the lens. Class 10 Physics Light Reflection Refraction: Power of a lens: Power of a lens. It is denoted by the letter D. If you remove the lens from your camera, the only kind of image you can produce is white light. Learn lens makers formula. What is LensIt is a transparent glassit is bound by 2 spherical surfacesHence, if 2 glass spheres are joined together, they form a lensWhat are Different Types of lensThey are of 2 typesConcave LensIt is thin in center but thicker at the edgesConvex LensIt is thick in middle but thinner at the edges Also See: CBSE Class 10 Science Syllabus 2019-2020 Session Introduction. Centres of curvature : A lens has two spherical surfaces. So we can conclude that a convex lens need not necessarily be a converging and a concave lens diverging. We all are familiar with light and its importance. A lens … A camera without a lens is useless to a photographer.