Monochromatic light of wavelength 6560 A0 falls normally on a grating 2 cm wide. The first order

Question

Monochromatic light of wavelength 6560 A^o falls normally on a grating 2 cm wide. The first order spectrum is produced at an angle of 16^o12' from the normal. Calculate the total no. lines on the grating

Answer 1

8506 lines per 2 cm