JEE Main & Advanced
Physics
Question Bank
Prism Theory and Dispersion of Light
question_answer
Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms [CPMT 1988]
A) A and C
B) B and C
C) A and B
D) In all prisms A, B and C
Correct Answer:
C
Solution :
In both A and B, the refracted ray is parallel to the base of prism.