Physics · 2021
JEE Main · 26 August 2021, Shift 1 · Q1
In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the…
In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are $\displaystyle 50$ divisions on the circular scale, and the main scale moves by $\displaystyle 0.5$ mm on a complete rotation. For a particular observation the reading on the main scale is $\displaystyle 5$ mm and the $\displaystyle 20^{\text {th }}$ division of the circular scale coincides with reference line. Calculate the true reading.
Official answer
(3)
5.$\displaystyle 15$ mm
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