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 $δ = (μ - 1) A,$ where A is the angle of the prism and $μ$ 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?

Question

Infinity Learn · Accepted Answer

Y coordinate of S’ will be $(μ - 1) A a$

,

X coordinate of S’ will be zero

Detailed Solution