Refraction of light when it goes from a Rarer Medium to a Denser Medium

Refraction of Light When it Goes From a Rarer Medium to a Denser Medium

 From figure  shows a ray of light AO going from air (a rarer medium) into glass (which is a denser medium). In this case, the  incident ray AO gets refracted at point O and bends towards the normal ON' and goes in the direction OB inside the glass slab. Thus, when a ray of light goes from air into glass, it bend towards the normal (at the point of incidence). In this case, the angle of refraction (r) is smaller than the angle of incidence (i). Water is also an optically denser medium than air, so when a ray of light goes from air into water, it bends towards the normal. Thus, the refraction of light on going from air to water is similar to the refraction of light from air to glass (which has been shown in Figure ). To show the path of a ray of light going from air into water, we can use Figure 4 but we will have to write ‘water’ in place of ‘glass’ and in place of glass slab we will have to show water by drawing some dotted lines. Please draw the diagram to show the refraction of a ray of light from air to water yourself.