John's Face Is 20 Cm in Front of a Concave

question 74

Multiple Choice

John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?

• A) 10 cm
• B) 20 cm
• C) 30 cm
• D) 40 cm
• E) 50 cm

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Definitions:

Financial Break-Even

The point at which total revenues are equal to total operating and financial costs, indicating a project or business is neither losing nor making money.

Accounting Break-Even

The point at which total revenues and total expenses are equal, resulting in neither profit nor loss, specifically in an accounting context.

Cash Break-Even

It refers to the point at which a business generates just enough revenue to cover its operating expenses, indicating no profit or loss.

Degree of Operating Leverage

A financial ratio that measures the sensitivity of a company’s operating income to its sales, indicating how a change in sales volume will impact operating income.