Refraction

The phenomenon of bending of light at the interface separating the two media when it travels from are medium to another is called refraction of light.

Refraction through a Glass Slab

                             Refraction through a Glass Slab

For direct light:

At surface PQ,

                         

At surface RS,

                             

For reflected light :

At surface RS,

                     

At surface PQ,

                     

From eq(1)  and eq(4)     

                       

 

From eq(2)  and eq(3)     

                           

Provided :

 Refracting surface parallels to each other.

 

Refraction through a Multiple Media:

                                       Refraction through a Multiple Media: