Nội dung text Chp_10_Light - Reflection and Refraction (Lec-7).pptx
Lec - 7
LEN S LEN S Magnifying glass Spectacles Contact lens Binoculars Microscope Telescope
A lens is a transparent medium bound by two surfaces. Converging Diverging Co n vex a curve outwards a curve inwards Co n cave Real focus Virtual focus LEN S
Distinguish between Convex and Concave lens Convex Concave A lens which has two spherical surfaces curved outwards is called convex lens. A lens which has two spherical surfaces curved inwards is called concave lens. It is a converging lens. It is a diverging lens. It forms a real focus. It forms a virtual focus. It is thick in the centre and thin at the edges. It is thin in the centre and thick at the edges. O F CONVE X O CONCAV E O CONCAV E F 1
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