The ray PQ shown in Fig. suffers minimum deviation in equilateral prism A. Two more identical prisms B and C and of the same material as A are now placed in contact as shown in the figure. If prism A produces a minimum deviation $δ_{m}$ , the deviation produced by the combination of prisms A, B and C will be

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3 $δ_{m}$

2 $δ_{m}$

$δ_{m}$

zero

answer is C.

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Detailed Solution

The ray PQ will undergo minimum deviation in prism A if the angle of incidence on A is such that the refracted ray in A is parallel to its base. Since prisms B and C are identical to A and are made of the same material as A, the refracted ray in A suffers no further deviations by prisms B and C. Hence the emergent ray from prism C will suffer the same deviation as that produced by prism A.

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