The micrometer shown in the figure below has two scales. The main scale has least count of 0.25 cm. And the circular scale has 25 divisions. What is the reading ('R' in mm) of caliper at the instant shown. Write in OMR sheet.

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Physics

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Vernier Calipers and Travelling Microscope

Question

The micrometer shown in the figure below has two scales. The main scale has least count of 0.25 cm. And the circular scale has 25 divisions. What is the reading ('R' in mm) of caliper at the instant shown. Write $(\frac{10 R}{9} - 40)$ in OMR sheet.

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Pitch = 0.25 cm
L. C.C. = $\frac{pitch}{no . of circular division} = \frac{0 .25}{25} = 0 .01 cm$
M.S.R. = 15 × 0.25 = 3.75 cm
C.S.R. = 12 × 0.01 = 0.12 cm
R = M.S.R. + C.S.R. = 3.87 cm = 38.7 mm

$\frac{10 R}{9} - 40 = (\frac{10}{9} \times 38 .7 - 40) = 3$