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Q28. A spherometer has 250 equal divisions marked along the periphery of its disc; and the full rotation of the disc advances on the main scale by 0.0625 cm. The least count of the system is 

        (a) 2.5 × 10–2 cm                                (b) 2.5 × 10–3 cm

        (c) 2.5 × 10–4 cm                                (d) None of these
 

Dear student,least count=pitch total number of divisions=0.0625250cm=2.5×10-4cmRegards

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