determine-the-maximum-value-of-angle-u-theta-at-which-the-upper-face-pq-of-the-p

Question

Determine the maximum value of angle θ at which the upper face PQ of the glass rod can be cut so that a light wave traveling parallel to the vertical part of the rod will be reflected back into the rod when it strikes face PQ. Consider the rod immersed in water with a refractive index of 1.33 and the refractive index of rod material is 1.70.

Diagram of a glass rod showing angle θ at face PQ for total internal reflection.

Accepted Answer

38.5°

Answer

54.0°

Answer

51.5°

Answer

36.0°