A certain eye subtended 0.035 radians when unaided and later 0.875 radians when aided by a particular optical instrument. Calculate the magnifying power of the instrument.
A
25
B
1
C
35
D
15
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
Magnifying power (angular magnification) of an optical instrument is given as:
M = \(\frac{\text{angle subtended by the image at the eye with the instrument}}{\text{angle subtended by the object at the eye without the instrument}}\) M = \(\frac{0.875}{0.035}\) = 25
Source: WAEC / JAMB / NECO Classroom Archive (Record #78298)