Question

125. A grating has 200 lines /mm, its grating elements is:
(a) 0.5 m
(b) 5 x 100 m
(C) 0.5 x 10^-2 m
(d) None of these​

Answer 1

Answer:

option d, none of this is the right answer

Answer 2

Explanation:

option D none of the right answer .❣️❣️❣️