A Very Fine Thread Is Placed Between Two Glass Plates

question 12

Multiple Choice

A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed. What is the thickness of the thread?

• A) 22.3 μm
• B) 26.7 μm
• C) 32.3 μm
• D) 53.3 μm
• E) 76.3 μm

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Definitions:

Automatization

The process by which a task becomes automatic after extensive practice, requiring little to no cognitive effort to perform.

Phenomenon

An observable event or fact, especially one that is not fully understood.

Means-End Analysis

A problem-solving strategy in which you continually evaluate the difference between your current state and your goal, and consider how to use your resources to reduce the difference.

Subroutines

In problem solving, specific procedures for solving familiar, welldefined problems.