Optics grating spacing

i got it ,thanks Abhishek sir u gave that much time for me only love u soooo much.. thanks rubii mam too

grating element and grating spacing is same i.e e+d... don't get confuse... look this formula.. sometimes in ques, they ask to calculate width of grating.. so W=N(e+d) is width of ...

here is the solution.. correct ans is 0.001cm.

Grating element and grating spacing are same thing. Just two different names. Here I have attached a detailed solution. And yes, it is a very good question. a conceptually rich one...

i hope u get it.

and we can calculte n like m attaching. you will get an idea from it.

we can calculate no of lines and it's reciprocal is grafting spacing