A Lens Is Made with a Focal Length of -40

question 79

Multiple Choice

A lens is made with a focal length of -40 cm using a material with index of refraction 1.50.A second lens is made with the SAME GEOMETRY as the first lens,but using a material having refractive index of 2.00.What is the focal length of the second lens?

• A) -40 cm
• B) -80 cm
• C) -53 cm
• D) -20 cm
• E) -30 cm

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Definitions:

Depreciation Write-Off

The accounting process of allocating the cost of tangible assets over their useful lives to account for declines in value.

Weighted Average Cost

A calculation that takes into account the varying costs and quantities of resources or components, producing a composite average cost.

Earnings Before Interest

Earnings before interest is a measure of a company's profitability that calculates earnings before the expense of interest is deducted; it’s part of the calculation used for EBIT (earnings before interest and taxes).

Unlevered Cost

The cost of financing a project or investment without any debt.