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Start JEE / NEET / Foundation preparation at rupees 99/day !!
21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
a vernier callipers with 20 divisions on the sliding scale
b
a screw gauge of pitch 1 mm and 100 divisions on the circular scale
c
an optical instruments that can measure length to within wavelength of light
d
all the above
answer is C.
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