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No I think Ans would Be 25 micro meter( C!!)first we have to find the value for the smallest division in eyepiece graticule...
for that :_ 0.1/40= 2.5 x 10^-3 mm
cnge mm into micrometer by multiplying 1000 with ur value
(2.5 x 10^-3) x 1000 = 2.5 micrometer <------- ths is the value for the smallest division in eyepiece graticule
frm the second diagram choose any chloroplast , measure its diameter
in the diagram one of the chloroplast's diameter is 3
so:- 3 x 2.5 = 7.5 micrometer
it is closer to 8 then our ans will b B
It says Nucleus not Cholroplast u misread it Againnnnnnnnnnnnnnnnn!!