A 45° prism of refractive index 1.60 is immersed in liquid of index 1.20. A ray enters normally. At the second face:
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A 45° prism of refractive index 1.60 is immersed in liquid of index 1.20. A ray enters normally. At the second face:

G1 Physics · Accepted Answer

Relative μ=1.60/1.20=4/3, so C=sin⁻¹(3/4)≈48.6°. Since internal incidence is 45°<C, the ray emerges.