Question

The pitch of a spherometer 1 nm
and no of head scale division
100. what is the least count of the Spherometer​

Answer 1

Answer:

Pitch, p = 1 mm

Number of divisions N =100

Least count C=

N

p

=0.01 mm

Zero error =e=+nC=+3(0.01)=+0.03mm

H =2+nC=2+63(0.01)=2.63 mm

Height of central leg above the feet of the outer legs =h

h=H−e=2.63−0.03=2.60 mm = 0.26 cm

a=4 cm

Using spherometer formula R =

6h

a

2

+

2

h

Substituting in spherometer formula

=

6(0.26)

(4)

2

+

2

0.26

=10.4 cm