(A) : It is possible to eliminate dispersion by combining two prism of different refracting angles and of different materials.
(R) : The angular dispersion depends on refractive index of the material of the prism.

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'A' is true and 'R' is false

Both 'A' and ‘R’ are false

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

answer is B.

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Detailed Solution

Two prisms of different angles and refractive index can be combined to produce zero dispersion .The condition for this is $(μ_{v} - μ_{R}) A + ({μ_{v}}^{'} - {μ_{R}}^{'}) A' = 0$ where A and A' are the angles of the prism and $μ a n d μ^{'}$ are the refractive index of the two prisms . The angular dispersion depends on the refractive index but for zero dispersion to happen above condition should be satisfied .