Question

What is the principle of ‘The Johansson Mikrokator’?

(a) Button spinning on a loop of string

(b) Principle of interference

(c) Optical magnification

(d) Principle of transformer

I had been asked this question by my school principal while I was bunking the class.

I want to ask this question from Uses of Comparators in division Comparators of Engineering Metrology

Answer 1

Right choice is (a) Button spinning on a loop of string

For explanation I would say: Johansson Mikrokator is a mechanical comparator used to obtain mechanical magnification. Principle of Johansson Mikrokator is ‘spinning of a button on a loop string’. Magnification of this comparator is of the order of 5000.