The Refractive Power of a Lens of Focal Length 40

question 48

Multiple Choice

The refractive power of a lens of focal length 40 cm is

• A) 4.0 D.
• B) 0.40 D.
• C) 2.5 D.
• D) −2.5 D.
• E) 0.16 D.

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Definitions:

January

The initial month in the Gregorian calendar, marking the start of the year.

Materials Quantity Variance

The financial difference between the actual quantity of materials used in production and the expected quantity, based on standard costs.

February

The second month of the year, often associated with cold weather in the Northern Hemisphere and used as a time period reference in accounting.

Materials Price Variance

The difference between the actual cost of materials and the expected (or standard) cost.