Q: Two spherometers A ans B have the same pitch , A has 100 divisions on periphery of its circular disc and B has 200 divisions on periphery of its circular disc . Then

(a) Both A and B have same least count

(b) L.C of A is twice the L.C of B

(c) L.C of A is half the L.C of B

(d) Nothing can be said

Sol: $L.C = \frac{Pitch}{Number \; of \;divisions \; on \;Circular \; Scale} $

As B has twice the number of divisions of A .

Hence , L.C of A is twice the L.C of B .