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Equation
       
    Name Angle of Minimum Deviation
 
    Equation n 2 n 1 = sin 1 2 ( a + δ m ) sin 1 2 α
 
    Definition of terms

n2 and n1 = the refractive indices of the two media, α = angle between the two interfaces, δm = angle for which the deviation is minimum

 
    Comments   This equation deals with light being refracted by a prism, the two faces of which are separated by an angle α, and a refractive index of n2 , compared to a refractive index outside the prism of n1 .

   The angle δ is defined as the angle between the incoming ray and the outgoing ray. This angle is minimised when δ = δm, δmcoming from the equation above.
 
    References Optics , M V Klein, John Wiley and Sons, 1970
       


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