However, the image formed with half the lens covered is less bright as compared to when it is uncovered. Very smooth or shiny, mirror-like surfaces have high specular reflectance, in which the incident light reflects in the same direction. Light not reflected from the sample is absorbed, scattered or transmitted. Diffuse reflection is when light hits an object and reflects in lots of different directions. Reflectance is light incident on the surface of a material that is reflected at an interface. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. Mount the lens on the table in the original position and repeat the above experiment.Ī focussed image is obtained in both the experiments. Reflection is when light bounces off an object. At first we will look at a single ray of light reflecting off of a flat surface, such as a. Take the lens and cover half of it with the second sheet of black paper. This picture shows multiple light reflections for curved surfaces. Mark the positions of candle, lens and screen. Now focus the image formed on the sheet of paper by moving the sheet only. Take the sheet of paper and place it on the other side of the lens as the candle. Turn of the lights of the room so that it gets dark. Light a candle with a match stick and place it on one side of the lens on the table. The law of reflection can be used to understand the images produced by plane and curved mirrors. This reflection of light is what enables us to see everything around. However, since the number of rays involved in the image formation reduces as the lens is covered, the image formed is of lesser intensity and less brighter.Īpparatus needed: convex lens, candle, two black sheets of paper. Rays of light reflect, or bounce off, objects just like a ball bounces on the ground. Since the entire lens is not covered, at least two rays from each point does pass through the lens and hence, image is formed. A point on the object needs only two rays to form an image.
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