A ray of light originates in medium A and is incident upon medium B. For which one of the following pairs of indices of refraction for A and B is total internal reflection not possible? 
Definitions:
Decibels
A unit of measurement used to express the intensity of sound, based on a logarithmic scale.
Loudness
A perceptual measure of the strength or intensity of a sound, often correlated with physical amplitude of the sound waves.
Olfactory Epithelium
This is a specialized epithelial tissue inside the nasal cavity that is involved in smell.
Receptor Cells
Specialized cells that convert external stimuli, such as light, sound, or chemicals, into electrical signals for the nervous system to process.
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