What magnifying power is attained using a compound microscope with the following specifications: objective focal length 1.50 cm, eyepiece focal length 2.42 cm, tube length 16.0 cm? Assume a near point of 25.0 cm and that the microscope is adjusted for viewing an image at infinity.
A) 110
B) 90.0
C) 12.0
D) 11.0
E) 8.00

Question

Quizplus · Accepted Answer

The magnifying power of a compound microscope is given by the formula:

M = (25 cm)/(f0/fe)(1+25/cm)

where f0 is the objective focal length, fe is the eyepiece focal length, and 25 cm is the near point.

Plugging in the values given, we get:

M = (25 cm)/[(1.50 cm)/(2.42 cm)](1+25/16) = 110

Therefore, the magnifying power attained is 110, which corresponds to choice letter A.

What Magnifying Power Is Attained Using a Compound Microscope with the Following