Which One of the Following Expressions Determines the Critical Angle $\theta$

question 19

Multiple Choice

Which one of the following expressions determines the critical angle for quartz (n = 1.5) immersed in oil (n = 1.1) ?

• A)\(\theta\)_c = 1.5/1.1
• B)\(\theta\)_c = sin^-1 (1.1/1.5)
• C)\(\theta\)_c = sin (1.1/1.5)
• D)\(\theta\)_c = tan^-1 (1.1/1.5)

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Definitions:

Neurotransmitter

Chemical substances in the brain that transmit signals from one neuron to another.

Excitatory Response

A reaction in neural tissue that increases the likelihood of a neuron firing an action potential, typically facilitated by neurotransmitters.

Voltage Shift

A change in the electrical potential difference between two points, which can affect the flow of electricity in a circuit.

Excitatory Effect

A response in which a neurotransmitter increases the likelihood that a neuron will fire an action potential.