Compound Microscope: the Focal Lengths of the Objective and the Eyepiece

question 104

Multiple Choice

Compound microscope: The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point) . The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope?

• A) -190 x
• B) -240 x
• C) -300 x
• D) -320 x
• E) -470 x

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Definitions:

Present Value

The immediate worth of a forthcoming amount of money or stream of cash inflows, evaluated at a particular rate of return.

Undiscounted Value

The future cash flow or financial benefits of an investment without applying a discount rate to account for the time value of money or inherent risks.

Sales-Type Lease

A lease agreement where the lessor recognizes immediate profits on the leased asset, as the present value of lease payments exceeds the asset’s fair market value.

Bargain Purchase Price

The acquisition price of an asset significantly below its fair market value.