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

question 165

Multiple Choice

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

• A) 40 cm
• B) 10 cm
• C) -50 cm
• D) 50 cm
• E) -40 cm

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Definitions:

Barriers to Entry

Factors that make it difficult or costly for new firms to enter and compete in an industry, such as high startup costs or strict regulations.

Pure Monopoly

A market structure where a single supplier controls all production and sale of a particular good or service, with no close substitutes.

Output Quantity

The total amount of a product or service produced by a company or industry.