Question

Three glass prisms A, B and C of same refractive indices are placed in contact with each other as shown in fig. 13.77 with no air gap between the prisms. A monochromatic ray of light OP passes through the prism assemble and emerges as QR. The condition of minimum deviation are satisfied in the prisms:

• A. A and C
• B. B and C
• C. A and B
• D. in all prisms A,B and C

Answer 1

The correct option is C A and B

In both $A$ and $B$, the refracted ray is parallel to the base of prism.