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A ray of light is incident on a prism ABC of refractive index
√3 as shown in figure.
B
60°
60°
D
60°
A
C
E
(a) Find the angle of incidence for which the deviation of
light ray by the prism ABC is minimum.
(b) By what angle the second identical prism must be rotated,
so that the final ray suffers net minimum deviation.

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