The Critical Angle for a Beam of Light Passing from Water

question 62

Multiple Choice

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

• A) totally reflected.
• B) partially reflected and partially transmitted.
• C) totally transmitted.
• D) totally absorbed by the water.

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Definitions:

Secretions

Substances produced and released by cells or glands within the body, which can serve various functions including lubrication, digestion, or immune responses.

Chest Physical Therapy

A range of treatments designed to improve respiratory efficiency, promote lung function, and help clear airways of mucus.

Cystic Fibrosis

A genetic disorder affecting the lungs and digestive system, characterized by thick, sticky mucus that can obstruct airways and ducts.

Postural Drainage

A technique used to clear mucus from the lungs by positioning the body so that gravity helps in the drainage process.