Which of the following have no unit?

1.	Which of the following have no unit?
Answer» Explanation: *And* *where* *are* *these* *following???? well,* *QUANTITIES* *having* no *unit* *are:- refractive* *index* *strain* *ETC.*.

Answer»

Explanation:

And where are these following????

well, QUANTITIES having no unit are:-

refractive index

strain ETC..

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