Page 2 - Lesson note refraction through glass slab
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air1n=sinrsine(1)(1)1n=sin⁡rsin⁡eor,n=sinesinr(2)(2)n=sin⁡esin⁡rfrom
                              equations 1 and 2sini=sine⇒i=esin⁡i=sin⁡e⇒i=eangle of incidence =
                              angle of emergence
                          o  It means that incident ray and emergent ray makes equal angles with
                              parallel normal N1QN2N1QN2 and N3RN4N3RN4 . Hence incident
                              and emergent rays are parallel.
                       lateral displacement of light in glass slab

                       When a ray of light is refracted from two refracting surfaces, the emergent ray
                       is displaced from the direction of the incident ray. This displacement of the
                       emergent ray from the path of the incident ray is called lateral shift. i. The
                       perpendicular distance between the two parallel refracting surfaces.

                       factors affecting lateral displacement of light in glass slab

               (1) The thickness of the glass slab: The lateral displacement increases with the
               increase in the thickness of the glass slab. (2) The angle of incidence: It increases
               with the increase in the angle of incidence. (3) The refractive index of glass: The
               wavelength of light used.























































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