Now, lets know what happen when a ray of light passes throuh rectangular glass slab What happen when a ray of ligt passes through a glass prism and why Dear students, if you have not learn said topics, then immediately visit the following links to study.On going from rare medium to denser medium, it bents towards the normal at the separating surface of two media.We may observe that a ray of light gets refracted away from the normal when it passes from denser medium to rare medium.
![]() That means, the ray is traveling from rare medium ( air ) to denser medium ( glass ) and hence it bents towards the normal. After that, it will emerge from glass that is it passes from denser medium ( glass ) to rare medium ( air ). Dear students. Here one thing is to be noted that incident medium and emergent medium both are same ( air ) and emergent ray is parallel to the incident ray. This parallelism is due to the parallelism of incident surface and emergent surfaces. The following image demonstrates the passing of a monochromatic light through a glass prism. Now lets discuss what should be the mathematical expression for this deviation. Lets discuss the factors affecting the value of angle of deviation when a ray of light passes through a glass prism. This graph clearly shows the relation between angle of incidnece and angle of deviation. At starting, if we increase the value of angle of incidnece, angle of deviation decreases. After reaching a specific value of angle of incidnece, the angle of deviation increasese with the increment of angle of incidence. The angle of deviation corresponding to the i is called as minimum angle of deviation. The value of angle of deviation is directly proportional to the refractive index of the the material of the prism. As we know that red colour has maximum wavelength, refractive for red colour is minimum.
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