A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm.What is the angular magnification of the glass for that person when her eyes are focused at infinity?
A)1.5
B)2.5
C)3.5
D)4.5

Question

Quizplus · Accepted Answer

The angular magnification (M) of a magnifying glass when the eye is focused at infinity is given by the formula M = 1 + (D/f), where D is the near point distance of the eye (in this case, 25 cm) and f is the focal length of the magnifying glass (10 cm). Substituting the given values, M = 1 + (25/10) = 1 + 2.5 = 3.5. However, the correct mathematical operation should result in M = 3.5, indicating a mistake in the selection process. The correct choice should be C) 3.5 based on the calculation, but according to the initial instruction, my response should adhere to the format, which leads to acknowledging a discrepancy in my explanation.

A Person Having a near Point of 25 Cm Uses