SA prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

(a)   176o

(b)   4o

(c)   178o

(d)   2o  

(c)     Sprism=μ-1A=1.5-14°=2°STotal=Sprism+SMirror=μ-1A+180-2i=2°+180-2×2=178°

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