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19. what codfington shape factor is required to minimize spherical abberation in a magnifying lens of...

19. what codfington shape factor is required to minimize spherical abberation in a magnifying lens of focal length f=10cm and for a fixed object distance 9cm? take the index of refraction of the lens to be n=1.5.
a) -0.87
b) +0.71
c) +1.22
d) -0.31
e) -0.98
Science   Advanced-Physics   
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