Question

Visible light of wavelength 676.5 nm is incident on a diffraction grating with d = 2857 nm. At what angle with respect to the central maximum is the fourth order maximum observed? O A fourth order maximum cannot be observed O 11.90 O 35.7° O 71.3° 0 55.6°

Answer 1

classmate Date Page a = 676.5 nm d 2857 nm dsino = na ماما = ا hours 47676-5) व 2857 0.94715 0 Oy 71.3 6 th 71.3 y option) X-X — (24 i = 660 nm PD = Path difference = 1320 nm .:- PD - na € na=1320 1320 660 2 (0) = 1 D (5th aption)