Consider a simple magnifying glass consisting of a single bi-convex lens with f
ID: 1997791 • Letter: C
Question
Consider a simple magnifying glass consisting of a single bi-convex lens with f = 4 cm.
(a) Calculate the range of magnifying powers that would be expected over the full range of human visual accommodation.
(b) Assume that this magnifying lens is used to examine the ridges of a human fingerprint.
(i) What is the angular separation between two neighboring ridges when the fingerprint is magnified?
(ii) What is the transverse magnification of the fingerprint?
(iii) Is the transverse magnification the same as the magnifying power? Explain the distinction between these two definitions of magnification and explain why transverse magnification is not used for magnifying lenses
Explanation / Answer
(a) magnification is gien by=25/f +1 =626
if object is placed at infinity
magnifying power=25/f=625
(b)(i) angular resolution=1.22*wavelength /diameter of lens
so we need wavelength for calculatiog this answer
(ii)transverese magnification=626