The Critical Angle for Light Rays Passing from Flint Glass

question 2

Multiple Choice

The critical angle for light rays passing from flint glass (n = 1.70) into air is about

• A)3.4º
• B)36º
• C)44º
• D)54º
• E)90º

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Definitions:

Boers

Descendants of the Dutch-speaking settlers of the Cape Colony in southern Africa during the 17th and 18th centuries, known for their role in the Boer Wars against British rule.

Republic of the Transvaal

A historical 19th-century Boer state in Southern Africa that gained independence from the United Kingdom in 1852 until its annexation after the Second Boer War.

Orange Free State

A historical Boer state in southern Africa that existed from 1854 to 1902, becoming a British colony thereafter.

Suez Canal

A man-made waterway in Egypt, opened in 1869, connecting the Mediterranean Sea to the Red Sea, significantly reducing travel time for maritime trade between Europe and Asia.