Page 1 - Lesson note refraction of light
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SAI INTERNATIONAL SCHOOL

                                                       PHYSICS
                                                       CLASS IX

                                 Chapter:LIGHT-REFLECTION AND REFRACTION
                                                      MODULE-26



               Refraction of light


                     We know about light and also know that light travels in a straight line path in a

                       medium or two different mediums with same density.
                     Now a question arises what happens when light travels from one medium to

                       another with different densities for example from air to glass.
                     When light ray is made to travel from one medium to another say from air to

                       glass medium then light rays bend at the boundary between the two mediums.

                     So, the bending of light when it passes from one medium to another is
                       called Refraction of light.

                     The refraction of light takes place on going from one medium to another
                       because the speed of light is different in two media.

                     The shortest path need not be the quickest path. Since light is always in a
                       hurry, it bends when it enters a different medium as it is still following the

                       quickest path. This phenomenon of light bending in a different medium is

                       called refraction.

































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