Question

why we cannot use group cause or similar instrument in estimation of very small distance​

Answer 1

Explanation:

Do not measure an object from the end of a metric ruler or meter stick, because the end is often imperfect. Instead, measure from the 1-centimeter mark, but remember to subtract a centimeter from the apparent measurement. Estimate any lengths that extend between marked units.

........Jay shree mahakal.....1=2