Q.

A vernier calipers having 1 main scale division = 0.1 cm is designed to have a least count of 0.02 cm. If n be the number of divisions on vernier scale and m be the length of vernier scale, then

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a

n=10, m=0.5 cm

b

n=9, m=0.4 cm

c

n=10, m=0.8 cm

d

n=10, m=0.2 cm

answer is C.

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Detailed Solution

1MSD=0.1 cmL C=1 M S D-1 V S D0.02 cm=0.1 cm-1 VSD1 VSD=0.1-0.02=0.08 cm1VSD=length of verenier scaleno. of divisions=0.08 cm mn=0.08 cmonly option (3) satisfy it.
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