– The number of ruled lines in one inch of a grating is 15000. The grating element is…
A. 1/15000 cm
B. 54/15000 cm
C. 15000/2.54 cm
D. 54/15000 inch
Answer:B
– The number of ruled lines in one inch of a grating is 15000. The grating element is…
A. 1/15000 cm B. 54/15000 cm C. 15000/2.54 cm D. 54/15000 inch