Plz solve this question?

Posted on 2016-04-20 18:13:00 in Physics by STRARC

A diffraction grating with 500 lines per mm is used to observe diffraction of monochromatic light of 
wavelength 600 nm. 
The light is passed through a narrow slit and the grating is placed so that its lines are parallel to 
the slit. Light passes through the slit and then the grating. 
Observer views the slit through the grating at different angles, moving his head from X parallel to the grating, through Y, opposite the slit, to Z parallel to the grating on the opposite side. 
How many images of the slit does he see? 
A) 3 B) 4 C) 6 D) 7 

the link is 
papers.gceguide.com/A%20Levels/Physics%2... 
question 27 

plz explain me the solution

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