Image formation from a thin prism: For a thin prism, at near normal incidence, the  angle of deviation does not vary considerably with angle of incidence and  consequently we may write angle of deviation as $\delta =(\mu -1)A,$ where A is the angle of the prism and $\mu$ is the refractive index of the material of the prism. Consider a thin  prism ABC and a source of light S. Suppose we want to trace the image of source S,  for sake of simplicity we draw a simple ray diagram as shown in the figure. Suppose we take S as the origin, S’ as the image of S and the horizontal and vertical  lines passing through S as x and y axis, and the distance SB as a (SB is  horizontal).Now using geometry and using the fact that angle CAB is small, we can  find the coordinates of S’.
    
Which of the following is/are correct?