Note: Angle of incidence = angle of emergence, i.e. The perpendicular distance between the emergent ray and incident ray when the light passes out of a glass slab is called lateral displacement. Here, i = angle of incidence, r = angle of refraction and e = angle of emergence So, the ray emerging from face CD is parallel to incident ray but shifted sideward slightly. The extent of bending of the ray of light at opposite parallel faces AB and CD of rectangular glass slab is equal and opposite. 2 (here glass slab is denser medium and air is rarer medium). In this case, refraction takes place twice first when ray enters glass slab from air and second when exits from glass slab to air.īoth refractions have been shown in Fig. When a light ray enters in a glass slab, then the emergent ray is parallel to the incident ray but it is shifted sideward slightly. Refraction through a Rectangular Glass Slab So when light enters a denser medium, its speed reduces and it bends towards the normal and when it enters rarer medium, its speed increases and it bends away from the normal. It is lesser in denser medium and higher in rarer medium. Speed of light is different in different media. Note: A medium in which the speed of light is more is known as optically rarer medium and the medium in which speed of light is lesser is known as optically denser medium. Where, i = angle of incidence and r = angle of refraction When light travels from a rarer medium to a denser one, it bends towards the normal (i > r) and when travels from a denser medium to a rarer one, it bends away from the normal (i < r) (as shown in Fig. Some drawing pins, a white sheet of paper, a rectangular glass slab, a protractor, a measuring scale, a drawing board, a sharp pencil and adhesive tape.Ĭhange in path of a light ray as it passes from one medium to another medium is called refraction of light. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. CBSE Class 10 Science Lab Manual – Refraction Through Glass Slab
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