A Puddle of Water Has a Thin Film of Gasoline

question 32

Multiple Choice

A puddle of water has a thin film of gasoline floating on it.A beam of light is shining perpendicular on the film.If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33,respectively,what is the minimum thickness of the film to see a bright reflection?

• A) 100 nm
• B) 200 nm
• C) 300 nm
• D) 400 nm
• E) 500 nm

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Definitions:

Chronic Obstructive Pulmonary Disease (COPD)

A group of progressive lung diseases, including emphysema and chronic bronchitis, characterized by airflow obstruction and breathing-related problems.

Paroxysmal Nocturnal Dyspnea

A condition characterized by sudden, severe shortness of breath at night, often waking the person from sleep, commonly associated with heart failure.

Tachycardia

A condition where the heart rate exceeds the norm for an individual's age, resting at over 100 beats per minute.

Orthopnea

Difficulty in breathing that occurs when lying down and is typically relieved by sitting or standing up, often associated with heart failure.