A parallel-sided horizontal slab of a low-refractive-index material (n2=1.15n_2 = 1.15n2=1.15) is surrounded by a dense optical fluid with a higher refractive index (n1=1.45n_1 = 1.45n1=1.45).
A monochromatic light ray is incident on the upper horizontal boundary, travelling downwards and rightwards as shown in the diagrams.
Which diagram shows the correct path of the light ray as it passes through the slab and emerges back into the dense fluid?
A
B
C
D