A person with a near-point distance of 32 cm is able to get a usable angular magnification of 12 with a particular magnifying glass. Her friend is only able to get a usable angular magnification of 7. What is the friend’s near-point distance?
we know that, the Angular magnification of the eyepiece
m = n/f where n is the near point and f is the focal length
f =n/m = 32/12 =2.66666667
again from the same formula we have, n = f x m for the friend, n2 = f x m2
= 2.66666667*7 = 18.6666667 cm
the friend’s near-point distance = 18.6666667 cm answer
A person with a near-point distance of 32 cm is able to get a usable angular...
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