Author Question: What is the angular separation of the two second-order spectral lines having wavelengths 417 nm and ... (Read 73 times)

bio_gurl · **on:** Jul 29, 2018

What is the angular separation of the two second-order spectral lines having wavelengths 417 nm and 388 nm using a diffraction grating having 456 lines/mm?

A) 1.63
B) 1.52
C) 0.815
D) 3.26

Question 2

Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern?

A) 0.39 m
B) 0.47 m
C) 0.93 m
D) 1.1 m
E) 1.9 m