In the Operation of a Laser

question 56

Multiple Choice

In the operation of a laser

• A) stimulated emission occurs.
• B) there is a population inversion.
• C) the excited state will tend to be metastable.
• D) the photons emitted will have transitioned to the ground state.
• E) For the answers (a), (b), (c), and (d), three are correct and one is incorrect.

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Definitions:

Hyperopia

A condition that occurs when light entering the eye is focused behind the retina; commonly called farsightedness.

Myopia

A vision condition also known as nearsightedness, where distant objects appear blurry while close objects are seen clearly.

Presbyopia

A condition associated with aging, where the eye gradually loses the ability to focus on close objects.

Cataracts

A medical condition where the lens of the eye becomes progressively opaque, resulting in blurred vision.