Tripling the Focal Length in a Telephoto Lens,while Keeping the Aperture

question 59

Multiple Choice

Tripling the focal length in a telephoto lens,while keeping the aperture size constant,will change the f-number by what factor?

• A)1/9
• B)1/3
• C)3
• D)9

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Definitions:

Book Value

The value of an asset according to its balance sheet account balance, which accounts for the cost of the asset minus any depreciation, amortization, or impairment costs.

Straight-Line Depreciation

A method of allocating the cost of a tangible asset over its useful life in equal installments.

Salvage Value

The expected salvage value of an asset at the termination of its useful period.

Depreciated

The reduction in the value of an asset over time due to wear and tear, aging, or obsolescence.