Question

(Q4.) for a plane transmission
grating with 5.5 ×10 +3 lines
per cm, calculate:
2) What is the longest wavelength of light for which a spectrum can be seen.
6.) for wavelength 6 X 10 -5 cm, what is the highest
order of spectrum which may be seen
(1.) If opaque spacings are exactly 3 times the
transparent spaces, which order of light will
be absent.​

Answer 1

Answer:

299,792 kilometres per second